

*Excludes Observations that spanned multiple years
B![]() | b![]() | t![]() | W![]() | w![]() | ||
|---|---|---|---|---|---|---|
| Pre 1970 | 0 | 0 | 5 | 0 | 102 | 107 |
| 1970 | 0 | 0 | 0 | 0 | 3 | 3 |
| 1971 | 0 | 0 | 0 | 0 | 10 | 10 |
| 1972 | 0 | 0 | 0 | 0 | 7 | 7 |
| 1973 | 0 | 0 | 0 | 0 | 6 | 6 |
| 1974 | 0 | 0 | 1 | 0 | 5 | 6 |
| 1975 | 0 | 0 | 1 | 0 | 8 | 9 |
| 1976 | 0 | 0 | 3 | 0 | 12 | 15 |
| 1977 | 0 | 0 | 1 | 0 | 12 | 13 |
| 1978 | 0 | 0 | 1 | 0 | 10 | 11 |
| 1979 | 0 | 0 | 6 | 0 | 16 | 22 |
| 1980 | 0 | 0 | 2 | 0 | 14 | 16 |
| 1981 | 0 | 0 | 3 | 0 | 20 | 23 |
| 1982 | 0 | 0 | 4 | 0 | 19 | 23 |
| 1983 | 0 | 0 | 2 | 0 | 16 | 18 |
| 1984 | 0 | 0 | 2 | 0 | 19 | 21 |
| 1985 | 0 | 0 | 3 | 0 | 21 | 24 |
| 1986 | 0 | 0 | 4 | 0 | 22 | 26 |
| 1987 | 0 | 0 | 9 | 0 | 25 | 34 |
| 1988 | 0 | 0 | 3 | 0 | 21 | 24 |
| 1989 | 0 | 0 | 2 | 0 | 20 | 22 |
| 1990 | 0 | 0 | 3 | 1 | 18 | 22 |
| 1991 | 0 | 0 | 21 | 3 | 19 | 43 |
| 1992 | 0 | 0 | 11 | 0 | 22 | 33 |
| 1993 | 0 | 0 | 8 | 0 | 24 | 32 |
| 1994 | 0 | 0 | 14 | 1 | 27 | 42 |
| 1995 | 0 | 0 | 17 | 1 | 23 | 41 |
| 1996 | 0 | 0 | 30 | 0 | 19 | 49 |
| 1997 | 0 | 0 | 15 | 1 | 23 | 39 |
| 1998 | 0 | 0 | 25 | 0 | 25 | 50 |
| 1999 | 0 | 0 | 9 | 0 | 20 | 29 |
| 2000 | 0 | 0 | 11 | 0 | 27 | 38 |
| 2001 | 0 | 0 | 15 | 0 | 32 | 47 |
| 2002 | 0 | 0 | 29 | 0 | 17 | 46 |
| 2003 | 0 | 0 | 20 | 0 | 17 | 37 |
| 2004 | 0 | 0 | 13 | 0 | 26 | 39 |
| 2005 | 0 | 0 | 13 | 0 | 25 | 38 |
| 2006 | 0 | 0 | 27 | 1 | 27 | 55 |
| 2007 | 0 | 0 | 16 | 2 | 29 | 47 |
| 2008 | 0 | 0 | 30 | 3 | 24 | 57 |
| 2009 | 0 | 0 | 17 | 0 | 28 | 45 |
| 2010 | 0 | 0 | 24 | 0 | 30 | 54 |
| 2011 | 0 | 0 | 57 | 0 | 50 | 107 |
| 2012 | 0 | 0 | 65 | 0 | 57 | 122 |
| 2013 | 0 | 0 | 106 | 2 | 35 | 143 |
| 2014 | 0 | 0 | 123 | 0 | 69 | 192 |
| 2015 | 0 | 0 | 163 | 0 | 117 | 280 |
| 2016 | 0 | 0 | 152 | 0 | 125 | 277 |
| 2017 | 0 | 0 | 214 | 1 | 153 | 368 |
| 2018 | 0 | 0 | 305 | 1 | 120 | 426 |
| 2019 | 0 | 0 | 362 | 6 | 151 | 519 |
| 2020 | 0 | 0 | 469 | 1 | 143 | 613 |
| 2021 | 0 | 0 | 361 | 1 | 189 | 551 |
| 2022 | 0 | 0 | 449 | 2 | 185 | 636 |
| 2023 | 0 | 0 | 280 | 0 | 130 | 410 |
| 2024 | 0 | 0 | 256 | 0 | 136 | 392 |
| 2025 | 0 | 0 | 2 | 0 | 3 | 5 |
| Total | 0 | 0 | 3784 | 27 | 2553 | 6364 |