| Year | Count |
|---|---|
| 1967 | 8 |
| 1971 | 5 |
| 1972 | 6 |
| 1977 | 5 |
| 1986 | 5 |
| 1987 | 5 |
| 1988 | 6 |
| 1989 | 10 |
| 1990 | 18 |
| 1991 | 18 |
| 1992 | 13 |
| 1993 | 21 |
| 1994 | 41 |
| 1995 | 27 |
| 1996 | 26 |
| 1997 | 27 |
| 1998 | 38 |
| 1999 | 25 |
| 2000 | 50 |
| 2001 | 41 |
| 2002 | 81 |
| 2003 | 85 |
| 2004 | 173 |
| 2005 | 100 |
| 2006 | 99 |
| 2007 | 90 |
| 2008 | 136 |
| 2009 | 78 |
| 2010 | 77 |
| 2011 | 96 |
| 2012 | 104 |
| 2013 | 94 |
| 2014 | 91 |
| 2015 | 135 |
| 2016 | 146 |
| 2017 | 110 |
| 2018 | 140 |
| 2019 | 121 |
| 2020 | 100 |
| 2021 | 274 |
| 2022 | 238 |
| 2023 | 313 |
| 2024 | 256 |