*Excludes Observations that spanned multiple years
Pre 1970 | 60 |
---|---|
1970 | 9 |
1971 | 2 |
1972 | 5 |
1973 | 4 |
1974 | 8 |
1975 | 6 |
1976 | 5 |
1977 | 5 |
1978 | 7 |
1979 | 14 |
1980 | 11 |
1981 | 11 |
1982 | 13 |
1983 | 25 |
1984 | 40 |
1985 | 32 |
1986 | 46 |
1987 | 67 |
1988 | 69 |
1989 | 62 |
1990 | 71 |
1991 | 82 |
1992 | 82 |
1993 | 73 |
1994 | 91 |
1995 | 89 |
1996 | 97 |
1997 | 115 |
1998 | 129 |
1999 | 137 |
2000 | 149 |
2001 | 153 |
2002 | 152 |
2003 | 179 |
2004 | 156 |
2005 | 164 |
2006 | 174 |
2007 | 169 |
2008 | 134 |
2009 | 152 |
2010 | 175 |
2011 | 141 |
2012 | 159 |
2013 | 147 |
2014 | 147 |
2015 | 132 |
2016 | 40 |
2017 | 0 |
2018 | 1 |
2019 | 1 |
2020 | 1 |
2021 | 0 |
2022 | 0 |
Total | 3993 |