| Year | Count |
|---|---|
| 1973 | 7 |
| 1976 | 10 |
| 1977 | 10 |
| 1979 | 5 |
| 1981 | 10 |
| 1982 | 5 |
| 1985 | 5 |
| 1986 | 5 |
| 1989 | 12 |
| 1991 | 10 |
| 1995 | 6 |
| 1997 | 5 |
| 1998 | 10 |
| 1999 | 7 |
| 2000 | 21 |
| 2001 | 30 |
| 2002 | 36 |
| 2003 | 24 |
| 2004 | 55 |
| 2005 | 40 |
| 2006 | 98 |
| 2007 | 102 |
| 2008 | 67 |
| 2009 | 62 |
| 2010 | 120 |
| 2011 | 92 |
| 2012 | 54 |
| 2013 | 32 |
| 2014 | 59 |
| 2015 | 89 |
| 2016 | 68 |
| 2017 | 118 |
| 2018 | 56 |
| 2019 | 73 |
| 2020 | 68 |
| 2021 | 64 |
| 2022 | 47 |
| 2023 | 65 |
| 2024 | 69 |