| Year | Count |
|---|---|
| 1979 | 10 |
| 1984 | 6 |
| 1985 | 5 |
| 1986 | 6 |
| 1989 | 10 |
| 1990 | 7 |
| 1991 | 11 |
| 1992 | 12 |
| 1993 | 9 |
| 1994 | 14 |
| 1995 | 18 |
| 1996 | 10 |
| 1997 | 8 |
| 1998 | 15 |
| 1999 | 19 |
| 2000 | 28 |
| 2001 | 21 |
| 2002 | 33 |
| 2003 | 43 |
| 2004 | 27 |
| 2005 | 36 |
| 2006 | 32 |
| 2007 | 37 |
| 2008 | 29 |
| 2009 | 56 |
| 2010 | 34 |
| 2011 | 46 |
| 2012 | 54 |
| 2013 | 49 |
| 2014 | 50 |
| 2015 | 47 |
| 2016 | 120 |
| 2017 | 122 |
| 2018 | 40 |
| 2019 | 93 |
| 2020 | 54 |
| 2021 | 94 |
| 2022 | 91 |
| 2023 | 68 |
| 2024 | 80 |