

*Excludes Observations that spanned multiple years
B![]()  |     b![]()  |     t![]()  |     W![]()  |     w![]()  |     ||
|---|---|---|---|---|---|---|
| Pre 1970 | 0 | 4 | 13 | 0 | 0 | 17 | 
| 1970 | 0 | 0 | 9 | 0 | 0 | 9 | 
| 1971 | 0 | 1 | 1 | 0 | 0 | 2 | 
| 1972 | 0 | 0 | 1 | 0 | 0 | 1 | 
| 1973 | 0 | 1 | 2 | 0 | 0 | 3 | 
| 1974 | 0 | 1 | 3 | 0 | 0 | 4 | 
| 1975 | 0 | 2 | 3 | 0 | 0 | 5 | 
| 1976 | 0 | 3 | 3 | 0 | 0 | 6 | 
| 1977 | 1 | 1 | 4 | 0 | 0 | 6 | 
| 1978 | 0 | 0 | 3 | 0 | 0 | 3 | 
| 1979 | 0 | 4 | 8 | 0 | 0 | 12 | 
| 1980 | 0 | 1 | 5 | 0 | 0 | 6 | 
| 1981 | 1 | 1 | 5 | 0 | 0 | 7 | 
| 1982 | 0 | 2 | 14 | 0 | 0 | 16 | 
| 1983 | 0 | 0 | 2 | 0 | 1 | 3 | 
| 1984 | 0 | 1 | 3 | 0 | 0 | 4 | 
| 1985 | 0 | 3 | 5 | 0 | 0 | 8 | 
| 1986 | 0 | 6 | 13 | 0 | 0 | 19 | 
| 1987 | 0 | 4 | 14 | 0 | 3 | 21 | 
| 1988 | 0 | 5 | 8 | 0 | 0 | 13 | 
| 1989 | 0 | 3 | 12 | 0 | 1 | 16 | 
| 1990 | 0 | 10 | 11 | 0 | 2 | 23 | 
| 1991 | 0 | 25 | 34 | 0 | 0 | 59 | 
| 1992 | 1 | 161 | 21 | 0 | 1 | 184 | 
| 1993 | 1 | 617 | 31 | 0 | 3 | 652 | 
| 1994 | 3 | 2214 | 40 | 0 | 0 | 2257 | 
| 1995 | 0 | 2079 | 41 | 0 | 0 | 2120 | 
| 1996 | 0 | 1957 | 33 | 0 | 0 | 1990 | 
| 1997 | 0 | 620 | 26 | 0 | 2 | 648 | 
| 1998 | 1 | 1216 | 46 | 0 | 1 | 1264 | 
| 1999 | 0 | 48 | 23 | 0 | 1 | 72 | 
| 2000 | 4 | 1452 | 57 | 0 | 1 | 1514 | 
| 2001 | 0 | 910 | 62 | 0 | 1 | 973 | 
| 2002 | 0 | 1615 | 45 | 0 | 0 | 1660 | 
| 2003 | 1 | 1106 | 47 | 0 | 0 | 1154 | 
| 2004 | 1 | 1938 | 44 | 0 | 3 | 1986 | 
| 2005 | 2 | 216 | 64 | 0 | 1 | 283 | 
| 2006 | 1 | 1037 | 74 | 0 | 1 | 1113 | 
| 2007 | 1 | 1492 | 128 | 0 | 1 | 1622 | 
| 2008 | 0 | 847 | 90 | 0 | 0 | 937 | 
| 2009 | 0 | 214 | 127 | 0 | 3 | 344 | 
| 2010 | 3 | 415 | 190 | 0 | 3 | 611 | 
| 2011 | 0 | 628 | 220 | 0 | 4 | 852 | 
| 2012 | 1 | 977 | 289 | 0 | 2 | 1269 | 
| 2013 | 12 | 1238 | 343 | 0 | 1 | 1594 | 
| 2014 | 2 | 1468 | 331 | 0 | 0 | 1801 | 
| 2015 | 5 | 1317 | 416 | 0 | 1 | 1739 | 
| 2016 | 3 | 1675 | 491 | 0 | 0 | 2169 | 
| 2017 | 5 | 1718 | 561 | 0 | 1 | 2285 | 
| 2018 | 6 | 1854 | 633 | 0 | 1 | 2494 | 
| 2019 | 6 | 1562 | 671 | 0 | 3 | 2242 | 
| 2020 | 2 | 1916 | 892 | 0 | 4 | 2814 | 
| 2021 | 3 | 1653 | 761 | 0 | 2 | 2419 | 
| 2022 | 5 | 1968 | 975 | 0 | 2 | 2950 | 
| 2023 | 10 | 2434 | 715 | 0 | 2 | 3161 | 
| 2024 | 10 | 2602 | 769 | 0 | 0 | 3381 | 
| 2025 | 0 | 0 | 13 | 0 | 0 | 13 | 
| Total | 91 | 43242 | 9445 | 0 | 52 | 52830 |