*Excludes Observations that spanned multiple years
Pre 1970 | 116 |
---|---|
1970 | 38 |
1971 | 26 |
1972 | 46 |
1973 | 25 |
1974 | 44 |
1975 | 27 |
1976 | 39 |
1977 | 46 |
1978 | 41 |
1979 | 71 |
1980 | 87 |
1981 | 124 |
1982 | 133 |
1983 | 159 |
1984 | 180 |
1985 | 192 |
1986 | 215 |
1987 | 134 |
1988 | 136 |
1989 | 302 |
1990 | 314 |
1991 | 271 |
1992 | 309 |
1993 | 249 |
1994 | 241 |
1995 | 247 |
1996 | 285 |
1997 | 298 |
1998 | 283 |
1999 | 337 |
2000 | 298 |
2001 | 349 |
2002 | 377 |
2003 | 339 |
2004 | 404 |
2005 | 419 |
2006 | 432 |
2007 | 477 |
2008 | 527 |
2009 | 548 |
2010 | 571 |
2011 | 425 |
2012 | 472 |
2013 | 343 |
2014 | 358 |
2015 | 389 |
2016 | 128 |
2017 | 0 |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
Total | 11871 |