*Excludes Observations that spanned multiple years
Pre 1970 | 11 |
---|---|
1970 | 23 |
1971 | 39 |
1972 | 22 |
1973 | 18 |
1974 | 41 |
1975 | 7 |
1976 | 3 |
1977 | 9 |
1978 | 32 |
1979 | 80 |
1980 | 1 |
1981 | 69 |
1982 | 6 |
1983 | 12 |
1984 | 35 |
1985 | 12 |
1986 | 6 |
1987 | 5 |
1988 | 20 |
1989 | 31 |
1990 | 31 |
1991 | 46 |
1992 | 28 |
1993 | 52 |
1994 | 54 |
1995 | 69 |
1996 | 55 |
1997 | 66 |
1998 | 63 |
1999 | 120 |
2000 | 194 |
2001 | 232 |
2002 | 156 |
2003 | 53 |
2004 | 29 |
2005 | 30 |
2006 | 47 |
2007 | 26 |
2008 | 22 |
2009 | 53 |
2010 | 53 |
2011 | 46 |
2012 | 46 |
2013 | 31 |
2014 | 62 |
2015 | 57 |
2016 | 45 |
2017 | 51 |
2018 | 111 |
2019 | 117 |
2020 | 74 |
2021 | 81 |
2022 | 98 |
2023 | 49 |
2024 | 2 |
Total | 2831 |