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 3054 1066 1996 2980 1053 1997 1863 643 1998 21682 9218 1999 13530 5190 2000 38626 15969 2001 39458 15327 2002 32601 14405 2003 57759 24032 2004 46343 17780 2005 81429 25066 2006 105090 33729 2007 191892 59309 2008 112440 32195 2009 93207 26271 2010 141269 38135 2011 158221 43886 2012 149479 41415 2013 221399 63072 2014 564602 143844 2015 798443 210131 2016 659402 171360 2017 554931 150209 2018 351901 98858 2019 864165 210934 2020 617524 157159 2021 831129 197360 2022 620464 177592 2023 558820 159834 2024 617575 177926 2025 211705 60532