Year Observations Objects 1950 2 1 1951 6 3 1953 4 2 1954 2 1 1955 4 2 1956 2 1 1960 6 3 1974 2 1 1975 2 1 1976 8 4 1977 2 1 1978 8 3 1981 4 2 1982 12 6 1983 8 4 1984 2 1 1985 8 4 1986 4 2 1987 2 1 1988 38 18 1990 32 14 1991 471 179 1992 743 301 1993 1308 487 1994 1681 617 1995 3051 1065 1996 2980 1053 1997 1863 643 1998 21682 9218 1999 13528 5189 2000 38624 15968 2001 39447 15322 2002 32602 14405 2003 57762 24033 2004 46338 17778 2005 81426 25065 2006 105094 33730 2007 191887 59308 2008 112426 32190 2009 93191 26266 2010 141252 38130 2011 158153 43867 2012 149438 41404 2013 221297 63045 2014 564741 143888 2015 798640 210187 2016 659403 171362 2017 554949 150210 2018 351856 98844 2019 864060 210909 2020 617498 157152 2021 830929 197312 2022 620295 177544 2023 558761 159819 2024 617552 177920 2025 212418 60732