*Excludes Observations that spanned multiple years
Pre 1970 | 8 |
---|---|
1970 | 0 |
1971 | 3 |
1972 | 1 |
1973 | 0 |
1974 | 0 |
1975 | 1 |
1976 | 0 |
1977 | 0 |
1978 | 5 |
1979 | 3 |
1980 | 2 |
1981 | 1 |
1982 | 2 |
1983 | 4 |
1984 | 9 |
1985 | 89 |
1986 | 89 |
1987 | 146 |
1988 | 604 |
1989 | 45 |
1990 | 50 |
1991 | 246 |
1992 | 116 |
1993 | 166 |
1994 | 108 |
1995 | 258 |
1996 | 84 |
1997 | 120 |
1998 | 11 |
1999 | 96 |
2000 | 147 |
2001 | 80 |
2002 | 46 |
2003 | 54 |
2004 | 67 |
2005 | 34 |
2006 | 63 |
2007 | 59 |
2008 | 75 |
2009 | 80 |
2010 | 81 |
2011 | 80 |
2012 | 70 |
2013 | 70 |
2014 | 67 |
2015 | 66 |
2016 | 65 |
2017 | 63 |
2018 | 39 |
2019 | 22 |
2020 | 18 |
2021 | 32 |
2022 | 45 |
2023 | 8 |
2024 | 0 |
Total | 3698 |