| Year | Count |
|---|---|
| 1947 | 5 |
| 1978 | 16 |
| 1985 | 34 |
| 1986 | 6 |
| 1987 | 5 |
| 1992 | 5 |
| 1994 | 12 |
| 1995 | 5 |
| 1996 | 25 |
| 1997 | 33 |
| 1998 | 21 |
| 1999 | 22 |
| 2000 | 38 |
| 2001 | 52 |
| 2002 | 32 |
| 2003 | 22 |
| 2004 | 34 |
| 2005 | 44 |
| 2006 | 40 |
| 2007 | 41 |
| 2008 | 51 |
| 2009 | 10 |
| 2010 | 36 |
| 2011 | 65 |
| 2012 | 48 |
| 2014 | 19 |
| 2015 | 18 |
| 2016 | 6 |
| 2017 | 19 |
| 2018 | 14 |
| 2020 | 32 |
| 2021 | 10 |
| 2022 | 18 |
| 2023 | 21 |
| 2024 | 20 |