| Year | Count |
|---|---|
| 1959 | 5 |
| 1961 | 5 |
| 1965 | 10 |
| 1970 | 10 |
| 1974 | 17 |
| 1976 | 7 |
| 1977 | 5 |
| 1978 | 12 |
| 1978 | 6 |
| 1989 | 5 |
| 1993 | 5 |
| 1994 | 5 |
| 1996 | 5 |
| 1998 | 17 |
| 2001 | 24 |
| 2002 | 25 |
| 2003 | 41 |
| 2004 | 37 |
| 2005 | 91 |
| 2006 | 106 |
| 2007 | 139 |
| 2008 | 122 |
| 2009 | 53 |
| 2010 | 65 |
| 2011 | 84 |
| 2012 | 50 |
| 2013 | 65 |
| 2014 | 38 |
| 2015 | 46 |
| 2016 | 42 |
| 2017 | 40 |
| 2018 | 32 |
| 2019 | 32 |
| 2020 | 32 |
| 2021 | 52 |
| 2022 | 48 |
| 2023 | 71 |
| 2024 | 64 |