*Excludes Observations that spanned multiple years
Pre 1970 | 2 |
---|---|
1970 | 0 |
1971 | 8 |
1972 | 0 |
1973 | 0 |
1974 | 0 |
1975 | 0 |
1976 | 0 |
1977 | 4 |
1978 | 4 |
1979 | 2 |
1980 | 2 |
1981 | 0 |
1982 | 0 |
1983 | 3 |
1984 | 7 |
1985 | 86 |
1986 | 73 |
1987 | 120 |
1988 | 405 |
1989 | 67 |
1990 | 64 |
1991 | 146 |
1992 | 208 |
1993 | 271 |
1994 | 82 |
1995 | 230 |
1996 | 192 |
1997 | 190 |
1998 | 69 |
1999 | 167 |
2000 | 140 |
2001 | 116 |
2002 | 47 |
2003 | 72 |
2004 | 112 |
2005 | 43 |
2006 | 95 |
2007 | 106 |
2008 | 117 |
2009 | 114 |
2010 | 97 |
2011 | 65 |
2012 | 105 |
2013 | 124 |
2014 | 111 |
2015 | 90 |
2016 | 105 |
2017 | 93 |
2018 | 108 |
2019 | 98 |
2020 | 51 |
2021 | 129 |
2022 | 76 |
2023 | 43 |
2024 | 19 |
Total | 4678 |