*Excludes Observations that spanned multiple years
Pre 1970 | 24 |
---|---|
1970 | 1 |
1971 | 0 |
1972 | 21 |
1973 | 12 |
1974 | 30 |
1975 | 16 |
1976 | 23 |
1977 | 19 |
1978 | 21 |
1979 | 28 |
1980 | 46 |
1981 | 42 |
1982 | 73 |
1983 | 62 |
1984 | 100 |
1985 | 116 |
1986 | 92 |
1987 | 30 |
1988 | 34 |
1989 | 141 |
1990 | 130 |
1991 | 114 |
1992 | 124 |
1993 | 168 |
1994 | 123 |
1995 | 161 |
1996 | 113 |
1997 | 79 |
1998 | 152 |
1999 | 170 |
2000 | 142 |
2001 | 181 |
2002 | 266 |
2003 | 207 |
2004 | 213 |
2005 | 242 |
2006 | 273 |
2007 | 300 |
2008 | 380 |
2009 | 375 |
2010 | 363 |
2011 | 194 |
2012 | 306 |
2013 | 193 |
2014 | 143 |
2015 | 300 |
2016 | 461 |
2017 | 11 |
2018 | 1 |
2019 | 1 |
2020 | 0 |
2021 | 0 |
Total | 6817 |