{
  "generated_at": "2026-07-21T06:15:33",
  "source": "https://www.jostjahn.de/itfsdaily/",
  "table_id": "utfs-development",
  "title": "Development of ITF data",
  "columns": [
    {
      "key": "year",
      "label": "Year"
    },
    {
      "key": "observations",
      "label": "Observations"
    },
    {
      "key": "objects",
      "label": "Objects"
    },
    {
      "key": "observations_per_object",
      "label": "Observations per Object"
    },
    {
      "key": "jan",
      "label": "Jan"
    },
    {
      "key": "feb",
      "label": "Feb"
    },
    {
      "key": "mar",
      "label": "Mar"
    },
    {
      "key": "apr",
      "label": "Apr"
    },
    {
      "key": "may",
      "label": "May"
    },
    {
      "key": "jun",
      "label": "Jun"
    },
    {
      "key": "jul",
      "label": "Jul"
    },
    {
      "key": "aug",
      "label": "Aug"
    },
    {
      "key": "sep",
      "label": "Sep"
    },
    {
      "key": "oct",
      "label": "Oct"
    },
    {
      "key": "nov",
      "label": "Nov"
    },
    {
      "key": "dec",
      "label": "Dec"
    }
  ],
  "rows": [
    {
      "year": "1950",
      "observations": "2",
      "objects": "1",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "2/1",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1951",
      "observations": "6",
      "objects": "3",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "2/1",
      "aug": "",
      "sep": "2/1",
      "oct": "",
      "nov": "",
      "dec": "2/1"
    },
    {
      "year": "1953",
      "observations": "14",
      "objects": "8",
      "observations_per_object": "1,7",
      "jan": "8/6",
      "feb": "4/4",
      "mar": "",
      "apr": "",
      "may": "2/1",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1954",
      "observations": "12",
      "objects": "5",
      "observations_per_object": "2,4",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "4/1",
      "sep": "6/3",
      "oct": "",
      "nov": "",
      "dec": "2/1"
    },
    {
      "year": "1955",
      "observations": "14",
      "objects": "7",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "4/2",
      "apr": "",
      "may": "10/5",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1956",
      "observations": "8",
      "objects": "4",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "2/1",
      "apr": "",
      "may": "6/3",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1960",
      "observations": "6",
      "objects": "3",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "4/2",
      "oct": "2/1",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1974",
      "observations": "2",
      "objects": "1",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "2/1",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1975",
      "observations": "2",
      "objects": "1",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "2/1",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1976",
      "observations": "8",
      "objects": "4",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "2/1",
      "apr": "",
      "may": "6/3",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1977",
      "observations": "2",
      "objects": "1",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "2/1",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1978",
      "observations": "12",
      "objects": "5",
      "observations_per_object": "2,4",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "8/3",
      "aug": "",
      "sep": "",
      "oct": "4/2",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1981",
      "observations": "18",
      "objects": "5",
      "observations_per_object": "3,6",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "18/5",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1982",
      "observations": "13",
      "objects": "7",
      "observations_per_object": "1,9",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "1/1",
      "may": "",
      "jun": "2/1",
      "jul": "2/1",
      "aug": "4/2",
      "sep": "",
      "oct": "2/1",
      "nov": "2/1",
      "dec": ""
    },
    {
      "year": "1983",
      "observations": "8",
      "objects": "4",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "2/1",
      "jun": "",
      "jul": "2/1",
      "aug": "",
      "sep": "",
      "oct": "4/2",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1984",
      "observations": "2",
      "objects": "1",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "2/1",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1985",
      "observations": "8",
      "objects": "4",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "2/1",
      "mar": "2/1",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "4/2",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1986",
      "observations": "4",
      "objects": "2",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "4/2",
      "dec": ""
    },
    {
      "year": "1987",
      "observations": "2",
      "objects": "1",
      "observations_per_object": "2,0",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "2/1",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1988",
      "observations": "38",
      "objects": "18",
      "observations_per_object": "2,1",
      "jan": "35/17",
      "feb": "3/1",
      "mar": "",
      "apr": "",
      "may": "",
      "jun": "",
      "jul": "",
      "aug": "",
      "sep": "",
      "oct": "",
      "nov": "",
      "dec": ""
    },
    {
      "year": "1990",
      "observations": "219",
      "objects": "78",
      "observations_per_object": "2,8",
      "jan": "",
      "feb": "",
      "mar": "",
      "apr": "",
      "may": "12/4",
      "jun": "41/14",
      "jul": "2/1",
      "aug": "12/6",
      "sep": "38/13",
      "oct": "72/25",
      "nov": "31/11",
      "dec": "11/4"
    },
    {
      "year": "1991",
      "observations": "861",
      "objects": "308",
      "observations_per_object": "2,8",
      "jan": "18/6",
      "feb": "23/8",
      "mar": "18/6",
      "apr": "39/13",
      "may": "63/21",
      "jun": "84/28",
      "jul": "",
      "aug": "54/27",
      "sep": "138/49",
      "oct": "107/40",
      "nov": "310/107",
      "dec": "7/3"
    },
    {
      "year": "1992",
      "observations": "675",
      "objects": "277",
      "observations_per_object": "2,4",
      "jan": "2/1",
      "feb": "6/2",
      "mar": "40/20",
      "apr": "16/7",
      "may": "33/14",
      "jun": "",
      "jul": "73/27",
      "aug": "39/19",
      "sep": "181/69",
      "oct": "137/57",
      "nov": "101/41",
      "dec": "47/20"
    },
    {
      "year": "1993",
      "observations": "1222",
      "objects": "458",
      "observations_per_object": "2,7",
      "jan": "75/29",
      "feb": "82/34",
      "mar": "86/34",
      "apr": "84/32",
      "may": "50/17",
      "jun": "65/24",
      "jul": "92/34",
      "aug": "104/39",
      "sep": "137/45",
      "oct": "361/134",
      "nov": "62/28",
      "dec": "24/9"
    },
    {
      "year": "1994",
      "observations": "1581",
      "objects": "587",
      "observations_per_object": "2,7",
      "jan": "185/73",
      "feb": "101/35",
      "mar": "135/47",
      "apr": "101/38",
      "may": "94/35",
      "jun": "36/13",
      "jul": "45/16",
      "aug": "86/30",
      "sep": "301/105",
      "oct": "342/137",
      "nov": "82/31",
      "dec": "73/28"
    },
    {
      "year": "1995",
      "observations": "2705",
      "objects": "950",
      "observations_per_object": "2,8",
      "jan": "183/65",
      "feb": "150/58",
      "mar": "65/24",
      "apr": "102/42",
      "may": "55/24",
      "jun": "48/19",
      "jul": "90/34",
      "aug": "112/41",
      "sep": "762/256",
      "oct": "687/229",
      "nov": "296/104",
      "dec": "155/54"
    },
    {
      "year": "1996",
      "observations": "2802",
      "objects": "992",
      "observations_per_object": "2,8",
      "jan": "166/60",
      "feb": "165/59",
      "mar": "187/71",
      "apr": "225/85",
      "may": "294/102",
      "jun": "72/26",
      "jul": "171/60",
      "aug": "91/31",
      "sep": "394/135",
      "oct": "423/151",
      "nov": "415/142",
      "dec": "199/70"
    },
    {
      "year": "1997",
      "observations": "2768",
      "objects": "943",
      "observations_per_object": "2,9",
      "jan": "154/57",
      "feb": "286/97",
      "mar": "261/89",
      "apr": "140/50",
      "may": "172/57",
      "jun": "95/33",
      "jul": "252/87",
      "aug": "162/59",
      "sep": "315/105",
      "oct": "473/159",
      "nov": "331/107",
      "dec": "127/44"
    },
    {
      "year": "1998",
      "observations": "24401",
      "objects": "8713",
      "observations_per_object": "2,8",
      "jan": "988/353",
      "feb": "135/40",
      "mar": "2143/761",
      "apr": "5222/1803",
      "may": "2527/866",
      "jun": "2277/762",
      "jul": "541/182",
      "aug": "1083/334",
      "sep": "4912/2090",
      "oct": "1306/431",
      "nov": "2050/687",
      "dec": "1217/412"
    },
    {
      "year": "1999",
      "observations": "13179",
      "objects": "5023",
      "observations_per_object": "2,6",
      "jan": "1092/381",
      "feb": "705/251",
      "mar": "2183/978",
      "apr": "513/173",
      "may": "654/197",
      "jun": "655/202",
      "jul": "172/53",
      "aug": "988/297",
      "sep": "1254/381",
      "oct": "3624/1651",
      "nov": "739/254",
      "dec": "600/208"
    },
    {
      "year": "2000",
      "observations": "37211",
      "objects": "15312",
      "observations_per_object": "2,4",
      "jan": "434/154",
      "feb": "4463/2025",
      "mar": "1586/525",
      "apr": "3273/1192",
      "may": "1799/563",
      "jun": "1278/339",
      "jul": "4862/2193",
      "aug": "9802/4823",
      "sep": "4952/1930",
      "oct": "994/400",
      "nov": "2077/716",
      "dec": "1691/461"
    },
    {
      "year": "2001",
      "observations": "42234",
      "objects": "16608",
      "observations_per_object": "2,5",
      "jan": "1150/352",
      "feb": "1740/578",
      "mar": "5532/2152",
      "apr": "1614/657",
      "may": "6909/3277",
      "jun": "1681/500",
      "jul": "2068/557",
      "aug": "6327/2736",
      "sep": "5083/1890",
      "oct": "5227/2159",
      "nov": "3155/1044",
      "dec": "1748/711"
    },
    {
      "year": "2002",
      "observations": "35775",
      "objects": "15310",
      "observations_per_object": "2,3",
      "jan": "2409/899",
      "feb": "5492/2519",
      "mar": "5772/2132",
      "apr": "5690/2631",
      "may": "706/285",
      "jun": "473/157",
      "jul": "489/157",
      "aug": "5792/2705",
      "sep": "1009/340",
      "oct": "1525/503",
      "nov": "3500/1620",
      "dec": "2918/1370"
    },
    {
      "year": "2003",
      "observations": "58456",
      "objects": "23916",
      "observations_per_object": "2,4",
      "jan": "1737/667",
      "feb": "2067/772",
      "mar": "3924/1492",
      "apr": "4431/1696",
      "may": "3187/1327",
      "jun": "3173/1236",
      "jul": "638/191",
      "aug": "10269/4662",
      "sep": "5221/1824",
      "oct": "12293/5239",
      "nov": "8909/4030",
      "dec": "2607/792"
    },
    {
      "year": "2004",
      "observations": "45997",
      "objects": "17510",
      "observations_per_object": "2,6",
      "jan": "1529/452",
      "feb": "4685/1939",
      "mar": "4579/1457",
      "apr": "2515/862",
      "may": "1708/563",
      "jun": "1147/371",
      "jul": "3590/1608",
      "aug": "7497/3346",
      "sep": "3828/1219",
      "oct": "6531/2708",
      "nov": "4740/1895",
      "dec": "3648/1097"
    },
    {
      "year": "2005",
      "observations": "308649",
      "objects": "138844",
      "observations_per_object": "2,2",
      "jan": "1672/521",
      "feb": "1265/396",
      "mar": "8517/3005",
      "apr": "5969/1902",
      "may": "4377/1377",
      "jun": "3410/1009",
      "jul": "4070/1164",
      "aug": "5732/2225",
      "sep": "76996/37430",
      "oct": "97919/45310",
      "nov": "82515/38786",
      "dec": "16207/5733"
    },
    {
      "year": "2006",
      "observations": "335244",
      "objects": "149496",
      "observations_per_object": "2,2",
      "jan": "8049/2345",
      "feb": "6257/1855",
      "mar": "6721/2125",
      "apr": "6727/2564",
      "may": "5783/1801",
      "jun": "2924/940",
      "jul": "1117/340",
      "aug": "18450/8480",
      "sep": "72814/34393",
      "oct": "119385/57788",
      "nov": "60985/28286",
      "dec": "26032/8594"
    },
    {
      "year": "2007",
      "observations": "195007",
      "objects": "60267",
      "observations_per_object": "3,2",
      "jan": "41855/13777",
      "feb": "12355/4041",
      "mar": "32702/10390",
      "apr": "18319/5976",
      "may": "3277/909",
      "jun": "3874/1254",
      "jul": "1291/423",
      "aug": "3378/1041",
      "sep": "20826/6084",
      "oct": "29315/8653",
      "nov": "19503/5270",
      "dec": "8312/2469"
    },
    {
      "year": "2008",
      "observations": "111848",
      "objects": "31833",
      "observations_per_object": "3,5",
      "jan": "8741/2681",
      "feb": "9714/2703",
      "mar": "11060/3040",
      "apr": "8705/2401",
      "may": "4211/1199",
      "jun": "8216/2691",
      "jul": "2283/619",
      "aug": "1836/588",
      "sep": "14566/4041",
      "oct": "22176/6126",
      "nov": "12593/3525",
      "dec": "7747/2256"
    },
    {
      "year": "2009",
      "observations": "92623",
      "objects": "25863",
      "observations_per_object": "3,6",
      "jan": "9118/2614",
      "feb": "7771/2277",
      "mar": "8359/2338",
      "apr": "5521/1544",
      "may": "3886/1051",
      "jun": "1957/605",
      "jul": "1282/411",
      "aug": "4372/1385",
      "sep": "18339/5046",
      "oct": "12771/3351",
      "nov": "15328/4190",
      "dec": "3919/1075"
    },
    {
      "year": "2010",
      "observations": "140839",
      "objects": "37486",
      "observations_per_object": "3,8",
      "jan": "4693/1236",
      "feb": "10459/2757",
      "mar": "10095/2713",
      "apr": "20510/6172",
      "may": "12234/3020",
      "jun": "8306/2026",
      "jul": "7894/1973",
      "aug": "2490/712",
      "sep": "18354/4847",
      "oct": "17349/4756",
      "nov": "17862/4666",
      "dec": "10593/2795"
    },
    {
      "year": "2011",
      "observations": "149702",
      "objects": "40702",
      "observations_per_object": "3,7",
      "jan": "30929/8758",
      "feb": "9341/2542",
      "mar": "9985/2751",
      "apr": "8875/2462",
      "may": "3633/983",
      "jun": "4058/1061",
      "jul": "4725/1342",
      "aug": "8751/2546",
      "sep": "18325/4915",
      "oct": "26043/6967",
      "nov": "17554/4680",
      "dec": "7483/1724"
    },
    {
      "year": "2012",
      "observations": "177289",
      "objects": "38812",
      "observations_per_object": "4,6",
      "jan": "11626/3068",
      "feb": "18139/3309",
      "mar": "19039/3433",
      "apr": "24332/4426",
      "may": "12550/2358",
      "jun": "9133/1809",
      "jul": "4931/351",
      "aug": "12345/3341",
      "sep": "10336/2712",
      "oct": "26520/7312",
      "nov": "15629/4147",
      "dec": "12709/2667"
    },
    {
      "year": "2013",
      "observations": "233751",
      "objects": "59012",
      "observations_per_object": "4,0",
      "jan": "14770/3521",
      "feb": "21621/4464",
      "mar": "20474/5301",
      "apr": "19388/3144",
      "may": "16907/4029",
      "jun": "8484/1792",
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