*Excludes Observations that spanned multiple years
Pre 1970 | 56 |
---|---|
1970 | 2 |
1971 | 10 |
1972 | 3 |
1973 | 2 |
1974 | 0 |
1975 | 2 |
1976 | 4 |
1977 | 17 |
1978 | 6 |
1979 | 7 |
1980 | 11 |
1981 | 5 |
1982 | 8 |
1983 | 12 |
1984 | 9 |
1985 | 86 |
1986 | 205 |
1987 | 321 |
1988 | 1134 |
1989 | 782 |
1990 | 106 |
1991 | 559 |
1992 | 410 |
1993 | 916 |
1994 | 2070 |
1995 | 1115 |
1996 | 960 |
1997 | 631 |
1998 | 161 |
1999 | 137 |
2000 | 125 |
2001 | 169 |
2002 | 138 |
2003 | 313 |
2004 | 439 |
2005 | 429 |
2006 | 318 |
2007 | 401 |
2008 | 444 |
2009 | 348 |
2010 | 453 |
2011 | 360 |
2012 | 361 |
2013 | 334 |
2014 | 350 |
2015 | 328 |
2016 | 326 |
2017 | 307 |
2018 | 158 |
2019 | 129 |
2020 | 64 |
2021 | 217 |
2022 | 170 |
2023 | 108 |
2024 | 19 |
Total | 16555 |