*Excludes Observations that spanned multiple years
Pre 1970 | 12 |
---|---|
1970 | 1 |
1971 | 8 |
1972 | 0 |
1973 | 1 |
1974 | 0 |
1975 | 4 |
1976 | 4 |
1977 | 16 |
1978 | 9 |
1979 | 11 |
1980 | 6 |
1981 | 13 |
1982 | 1 |
1983 | 16 |
1984 | 7 |
1985 | 30 |
1986 | 93 |
1987 | 132 |
1988 | 526 |
1989 | 83 |
1990 | 81 |
1991 | 445 |
1992 | 476 |
1993 | 530 |
1994 | 130 |
1995 | 548 |
1996 | 240 |
1997 | 275 |
1998 | 112 |
1999 | 175 |
2000 | 172 |
2001 | 288 |
2002 | 100 |
2003 | 129 |
2004 | 199 |
2005 | 114 |
2006 | 117 |
2007 | 145 |
2008 | 135 |
2009 | 155 |
2010 | 399 |
2011 | 239 |
2012 | 107 |
2013 | 179 |
2014 | 172 |
2015 | 133 |
2016 | 272 |
2017 | 330 |
2018 | 301 |
2019 | 380 |
2020 | 286 |
2021 | 358 |
2022 | 406 |
2023 | 379 |
2024 | 45 |
Total | 9525 |