| Year | Count |
|---|---|
| 1972 | 5 |
| 1974 | 6 |
| 1976 | 10 |
| 1978 | 10 |
| 1983 | 5 |
| 1987 | 7 |
| 1988 | 15 |
| 1989 | 23 |
| 1990 | 18 |
| 1991 | 19 |
| 1992 | 21 |
| 1993 | 20 |
| 1994 | 21 |
| 1995 | 31 |
| 1996 | 32 |
| 1997 | 51 |
| 1997 | 10 |
| 1998 | 48 |
| 1999 | 50 |
| 2000 | 54 |
| 2000 | 6 |
| 2001 | 55 |
| 2001 | 5 |
| 2002 | 57 |
| 2002 | 5 |
| 2003 | 67 |
| 2004 | 58 |
| 2005 | 83 |
| 2006 | 55 |
| 2007 | 44 |
| 2008 | 59 |
| 2009 | 48 |
| 2009 | 5 |
| 2010 | 51 |
| 2011 | 48 |
| 2011 | 6 |
| 2012 | 63 |
| 2013 | 43 |
| 2014 | 58 |
| 2015 | 46 |
| 2016 | 129 |
| 2017 | 132 |
| 2018 | 46 |
| 2019 | 106 |
| 2020 | 80 |
| 2021 | 100 |
| 2021 | 6 |
| 2022 | 90 |
| 2023 | 74 |
| 2024 | 72 |