*Excludes Observations that spanned multiple years
| B | b | t | W | w | ||
|---|---|---|---|---|---|---|
| Pre 1970 | 0 | 3 | 7 | 0 | 38 | 48 |
| 1970 | 0 | 0 | 7 | 0 | 1 | 8 |
| 1971 | 0 | 0 | 0 | 0 | 4 | 4 |
| 1972 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1973 | 0 | 0 | 2 | 0 | 2 | 4 |
| 1974 | 0 | 0 | 1 | 0 | 2 | 3 |
| 1975 | 0 | 1 | 3 | 0 | 3 | 7 |
| 1976 | 0 | 1 | 2 | 0 | 7 | 10 |
| 1977 | 0 | 0 | 14 | 0 | 4 | 18 |
| 1978 | 0 | 0 | 10 | 0 | 3 | 13 |
| 1979 | 0 | 5 | 22 | 0 | 4 | 31 |
| 1980 | 1 | 4 | 9 | 0 | 0 | 14 |
| 1981 | 0 | 1 | 7 | 0 | 7 | 15 |
| 1982 | 0 | 1 | 7 | 0 | 4 | 12 |
| 1983 | 0 | 0 | 4 | 0 | 1 | 5 |
| 1984 | 0 | 0 | 6 | 0 | 2 | 8 |
| 1985 | 0 | 0 | 3 | 0 | 1 | 4 |
| 1986 | 0 | 1 | 9 | 0 | 4 | 14 |
| 1987 | 0 | 1 | 20 | 0 | 7 | 28 |
| 1988 | 0 | 1 | 10 | 0 | 7 | 18 |
| 1989 | 0 | 7 | 19 | 0 | 11 | 37 |
| 1990 | 0 | 40 | 18 | 0 | 4 | 62 |
| 1991 | 1 | 32 | 17 | 0 | 5 | 55 |
| 1992 | 1 | 28 | 20 | 0 | 7 | 56 |
| 1993 | 7 | 139 | 27 | 0 | 2 | 175 |
| 1994 | 3 | 377 | 58 | 0 | 1 | 439 |
| 1995 | 11 | 600 | 36 | 0 | 3 | 650 |
| 1996 | 6 | 263 | 59 | 0 | 1 | 329 |
| 1997 | 7 | 1884 | 34 | 0 | 4 | 1929 |
| 1998 | 13 | 1390 | 60 | 0 | 5 | 1468 |
| 1999 | 1 | 1166 | 38 | 0 | 4 | 1209 |
| 2000 | 5 | 1607 | 39 | 1 | 12 | 1664 |
| 2001 | 2 | 1653 | 40 | 0 | 9 | 1704 |
| 2002 | 2 | 1934 | 144 | 0 | 2 | 2082 |
| 2003 | 7 | 2495 | 103 | 0 | 2 | 2607 |
| 2004 | 2 | 2756 | 138 | 0 | 5 | 2901 |
| 2005 | 4 | 1822 | 411 | 0 | 7 | 2244 |
| 2006 | 5 | 2301 | 440 | 0 | 3 | 2749 |
| 2007 | 3 | 2125 | 188 | 0 | 2 | 2318 |
| 2008 | 8 | 1190 | 290 | 0 | 3 | 1491 |
| 2009 | 6 | 1357 | 392 | 0 | 1 | 1756 |
| 2010 | 9 | 1775 | 473 | 0 | 0 | 2257 |
| 2011 | 2 | 1037 | 500 | 0 | 5 | 1544 |
| 2012 | 3 | 1874 | 487 | 0 | 4 | 2368 |
| 2013 | 1 | 1111 | 477 | 0 | 0 | 1589 |
| 2014 | 1 | 710 | 336 | 0 | 0 | 1047 |
| 2015 | 3 | 110 | 104 | 0 | 2 | 219 |
| 2016 | 0 | 25 | 100 | 0 | 1 | 126 |
| 2017 | 1 | 127 | 17 | 0 | 1 | 146 |
| 2018 | 0 | 0 | 1 | 0 | 0 | 1 |
| Total | 115 | 31954 | 5209 | 1 | 207 | 37486 |