| Year | Count |
|---|---|
| 1971 | 6 |
| 1972 | 16 |
| 1973 | 10 |
| 1974 | 7 |
| 1975 | 15 |
| 1977 | 13 |
| 1978 | 5 |
| 1991 | 5 |
| 1992 | 12 |
| 1993 | 26 |
| 1994 | 5 |
| 1994 | 40 |
| 1995 | 7 |
| 1995 | 26 |
| 1996 | 8 |
| 1996 | 11 |
| 1997 | 5 |
| 1997 | 24 |
| 1998 | 19 |
| 1998 | 57 |
| 1999 | 28 |
| 2000 | 7 |
| 2000 | 20 |
| 2001 | 5 |
| 2001 | 51 |
| 2002 | 18 |
| 2002 | 21 |
| 2003 | 5 |
| 2003 | 30 |
| 2004 | 16 |
| 2004 | 7 |
| 2005 | 10 |
| 2006 | 37 |
| 2006 | 8 |
| 2007 | 18 |
| 2007 | 5 |
| 2008 | 105 |
| 2009 | 88 |
| 2009 | 10 |
| 2010 | 95 |
| 2010 | 10 |
| 2011 | 75 |
| 2011 | 6 |
| 2012 | 65 |
| 2012 | 29 |
| 2013 | 10 |
| 2013 | 14 |
| 2014 | 12 |
| 2014 | 5 |
| 2016 | 41 |
| 2016 | 12 |
| 2017 | 20 |
| 2017 | 10 |
| 2018 | 20 |
| 2019 | 11 |
| 2019 | 14 |
| 2020 | 18 |
| 2021 | 19 |
| 2021 | 15 |
| 2022 | 17 |
| 2023 | 25 |
| 2024 | 29 |
| 2024 | 12 |