| Year | Count |
|---|---|
| 1953 | 8 |
| 1954 | 5 |
| 1955 | 18 |
| 1956 | 23 |
| 1957 | 10 |
| 1958 | 18 |
| 1959 | 10 |
| 1960 | 20 |
| 1974 | 5 |
| 1978 | 5 |
| 1982 | 5 |
| 1985 | 12 |
| 1988 | 8 |
| 1989 | 7 |
| 1996 | 23 |
| 1997 | 12 |
| 1998 | 20 |
| 1999 | 21 |
| 2000 | 24 |
| 2001 | 21 |
| 2002 | 48 |
| 2003 | 64 |
| 2004 | 55 |
| 2005 | 97 |
| 2006 | 66 |
| 2007 | 52 |
| 2008 | 30 |
| 2009 | 26 |
| 2010 | 31 |
| 2011 | 32 |
| 2012 | 9 |
| 2013 | 5 |
| 2014 | 6 |
| 2015 | 7 |
| 2016 | 5 |
| 2018 | 10 |
| 2019 | 16 |
| 2020 | 15 |
| 2021 | 37 |
| 2022 | 7 |
| 2023 | 26 |
| 2024 | 7 |