*Excludes Observations that spanned multiple years
Pre 1970 | 19 |
---|---|
1970 | 222 |
1971 | 252 |
1972 | 262 |
1973 | 76 |
1974 | 135 |
1975 | 118 |
1976 | 103 |
1977 | 301 |
1978 | 233 |
1979 | 254 |
1980 | 604 |
1981 | 180 |
1982 | 603 |
1983 | 162 |
1984 | 195 |
1985 | 186 |
1986 | 54 |
1987 | 75 |
1988 | 103 |
1989 | 42 |
1990 | 110 |
1991 | 76 |
1992 | 48 |
1993 | 97 |
1994 | 52 |
1995 | 49 |
1996 | 53 |
1997 | 63 |
1998 | 62 |
1999 | 49 |
2000 | 32 |
2001 | 33 |
2002 | 64 |
2003 | 41 |
2004 | 43 |
2005 | 68 |
2006 | 41 |
2007 | 485 |
2008 | 155 |
2009 | 185 |
2010 | 114 |
2011 | 133 |
2012 | 146 |
2013 | 742 |
2014 | 86 |
2015 | 224 |
2016 | 373 |
2017 | 32 |
2018 | 62 |
2019 | 112 |
2020 | 41 |
2021 | 26 |
2022 | 65 |
2023 | 22 |
Total | 8163 |