*Excludes Observations that spanned multiple years
Pre 1970 | 210 |
---|---|
1970 | 1 |
1971 | 2 |
1972 | 2 |
1973 | 7 |
1974 | 2 |
1975 | 2 |
1976 | 1 |
1977 | 61 |
1978 | 1 |
1979 | 2 |
1980 | 1 |
1981 | 1 |
1982 | 1 |
1983 | 6 |
1984 | 3 |
1985 | 369 |
1986 | 842 |
1987 | 5 |
1988 | 1 |
1989 | 54 |
1990 | 154 |
1991 | 13 |
1992 | 3 |
1993 | 15 |
1994 | 83 |
1995 | 70 |
1996 | 749 |
1997 | 110 |
1998 | 253 |
1999 | 835 |
2000 | 386 |
2001 | 909 |
2002 | 819 |
2003 | 2694 |
2004 | 2135 |
2005 | 922 |
2006 | 1373 |
2007 | 2230 |
2008 | 1452 |
2009 | 3293 |
2010 | 4499 |
2011 | 2738 |
2012 | 2020 |
2013 | 4260 |
2014 | 2371 |
2015 | 2879 |
2016 | 1440 |
2017 | 1483 |
2018 | 2209 |
2019 | 736 |
2020 | 34 |
2021 | 0 |
Total | 44741 |