| Year | Count |
|---|---|
| 1972 | 5 |
| 1980 | 94 |
| 1981 | 68 |
| 1981 | 6 |
| 1982 | 36 |
| 1982 | 5 |
| 1983 | 35 |
| 1983 | 10 |
| 1985 | 10 |
| 1986 | 7 |
| 1991 | 11 |
| 1993 | 5 |
| 1994 | 6 |
| 1995 | 6 |
| 1997 | 15 |
| 1997 | 16 |
| 1998 | 6 |
| 1998 | 7 |
| 1999 | 5 |
| 1999 | 43 |
| 2000 | 28 |
| 2001 | 6 |
| 2001 | 32 |
| 2002 | 28 |
| 2002 | 10 |
| 2003 | 17 |
| 2003 | 76 |
| 2004 | 20 |
| 2004 | 103 |
| 2005 | 50 |
| 2006 | 50 |
| 2007 | 5 |
| 2007 | 34 |
| 2008 | 12 |
| 2009 | 28 |
| 2010 | 25 |
| 2011 | 43 |
| 2012 | 28 |
| 2013 | 37 |
| 2014 | 21 |
| 2015 | 5 |
| 2015 | 30 |
| 2016 | 10 |
| 2017 | 24 |
| 2020 | 21 |
| 2021 | 17 |
| 2022 | 5 |
| 2022 | 13 |
| 2023 | 7 |
| 2024 | 5 |