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 492 186 1992 770 310 1993 1356 504 1994 1877 685 1995 3324 1156 1996 3559 1250 1997 2312 789 1998 23170 9773 1999 14478 5551 2000 40121 16638 2001 40978 15969 2002 32095 14357 2003 60275 25020 2004 47522 18229 2005 83706 25748 2006 108193 34640 2007 199089 61247 2008 120485 34350 2009 98687 27767 2010 114011 31733 2011 169113 46820 2012 158839 43960 2013 238130 67701 2014 580959 149211 2015 703049 186453 2016 676946 175775 2017 575858 155718 2018 376267 105538 2019 902302 220734 2020 652036 166405 2021 870779 207625 2022 645355 184769 2023 592561 169607 2024 373359 108475