| Year | Count |
|---|---|
| 1966 | 5 |
| 1970 | 8 |
| 1972 | 8 |
| 1973 | 14 |
| 1974 | 11 |
| 1975 | 37 |
| 1976 | 5 |
| 1977 | 32 |
| 1978 | 33 |
| 1979 | 67 |
| 1980 | 57 |
| 1981 | 16 |
| 1983 | 9 |
| 1985 | 32 |
| 1986 | 12 |
| 1987 | 34 |
| 1988 | 24 |
| 1989 | 13 |
| 1990 | 40 |
| 1991 | 19 |
| 1992 | 66 |
| 1993 | 43 |
| 1994 | 90 |
| 1995 | 132 |
| 1996 | 196 |
| 1997 | 292 |
| 1998 | 494 |
| 1999 | 347 |
| 2000 | 426 |
| 2001 | 396 |
| 2002 | 429 |
| 2003 | 445 |
| 2004 | 570 |
| 2005 | 633 |
| 2006 | 656 |
| 2007 | 508 |
| 2008 | 525 |
| 2009 | 490 |
| 2010 | 429 |
| 2011 | 403 |
| 2012 | 378 |
| 2013 | 387 |
| 2014 | 414 |
| 2015 | 570 |
| 2016 | 591 |
| 2017 | 744 |
| 2018 | 654 |
| 2019 | 580 |
| 2020 | 611 |
| 2021 | 745 |
| 2022 | 876 |
| 2023 | 760 |
| 2024 | 731 |