*Excludes Observations that spanned multiple years
| B | b | t | W | w | ||
|---|---|---|---|---|---|---|
| Pre 1970 | 0 | 0 | 3 | 0 | 24 | 27 |
| 1970 | 0 | 0 | 1 | 0 | 0 | 1 |
| 1971 | 0 | 0 | 0 | 0 | 4 | 4 |
| 1972 | 0 | 0 | 1 | 0 | 4 | 5 |
| 1973 | 0 | 0 | 0 | 0 | 3 | 3 |
| 1974 | 0 | 0 | 0 | 0 | 4 | 4 |
| 1975 | 0 | 1 | 1 | 0 | 3 | 5 |
| 1976 | 0 | 0 | 1 | 0 | 4 | 5 |
| 1977 | 0 | 0 | 4 | 0 | 3 | 7 |
| 1978 | 0 | 0 | 3 | 0 | 6 | 9 |
| 1979 | 0 | 0 | 6 | 0 | 5 | 11 |
| 1980 | 0 | 1 | 8 | 0 | 9 | 18 |
| 1981 | 1 | 0 | 3 | 0 | 5 | 9 |
| 1982 | 0 | 0 | 4 | 0 | 10 | 14 |
| 1983 | 0 | 0 | 4 | 0 | 7 | 11 |
| 1984 | 0 | 0 | 3 | 0 | 6 | 9 |
| 1985 | 0 | 0 | 2 | 0 | 9 | 11 |
| 1986 | 1 | 0 | 7 | 0 | 7 | 15 |
| 1987 | 0 | 0 | 11 | 0 | 7 | 18 |
| 1988 | 2 | 4 | 15 | 0 | 10 | 31 |
| 1989 | 0 | 4 | 26 | 0 | 8 | 38 |
| 1990 | 0 | 10 | 3 | 0 | 6 | 19 |
| 1991 | 0 | 9 | 12 | 0 | 7 | 28 |
| 1992 | 2 | 44 | 12 | 1 | 9 | 68 |
| 1993 | 2 | 171 | 58 | 0 | 11 | 242 |
| 1994 | 2 | 632 | 110 | 0 | 11 | 755 |
| 1995 | 2 | 508 | 74 | 1 | 15 | 600 |
| 1996 | 0 | 1168 | 72 | 0 | 9 | 1249 |
| 1997 | 0 | 357 | 74 | 0 | 13 | 444 |
| 1998 | 2 | 572 | 5 | 0 | 8 | 587 |
| 1999 | 0 | 33 | 9 | 0 | 8 | 50 |
| 2000 | 3 | 611 | 33 | 0 | 17 | 664 |
| 2001 | 0 | 330 | 20 | 0 | 16 | 366 |
| 2002 | 0 | 480 | 19 | 0 | 11 | 510 |
| 2003 | 0 | 344 | 26 | 0 | 13 | 383 |
| 2004 | 1 | 525 | 22 | 0 | 12 | 560 |
| 2005 | 0 | 46 | 18 | 0 | 16 | 80 |
| 2006 | 1 | 323 | 26 | 0 | 20 | 370 |
| 2007 | 4 | 573 | 39 | 1 | 11 | 628 |
| 2008 | 0 | 198 | 44 | 2 | 9 | 253 |
| 2009 | 1 | 48 | 37 | 1 | 4 | 91 |
| 2010 | 3 | 184 | 104 | 0 | 3 | 294 |
| 2011 | 2 | 158 | 73 | 0 | 15 | 248 |
| 2012 | 0 | 223 | 87 | 0 | 9 | 319 |
| 2013 | 0 | 24 | 163 | 0 | 3 | 190 |
| 2014 | 0 | 63 | 78 | 0 | 0 | 141 |
| 2015 | 0 | 5 | 19 | 0 | 0 | 24 |
| 2016 | 0 | 5 | 1 | 0 | 0 | 6 |
| 2017 | 0 | 1 | 3 | 0 | 0 | 4 |
| 2018 | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 29 | 7655 | 1344 | 6 | 394 | 9428 |