| Year | Count |
|---|---|
| 1958 | 12 |
| 1959 | 14 |
| 1962 | 9 |
| 1963 | 6 |
| 1965 | 5 |
| 1966 | 5 |
| 1969 | 7 |
| 1970 | 12 |
| 1971 | 8 |
| 1972 | 6 |
| 1973 | 6 |
| 1974 | 8 |
| 1976 | 9 |
| 1977 | 12 |
| 1978 | 10 |
| 1986 | 5 |
| 1990 | 8 |
| 1992 | 5 |
| 1993 | 5 |
| 1994 | 5 |
| 1995 | 5 |
| 1998 | 5 |
| 1999 | 5 |
| 2001 | 6 |
| 2002 | 6 |
| 2004 | 8 |
| 2005 | 8 |
| 2006 | 16 |
| 2007 | 8 |
| 2008 | 11 |
| 2009 | 9 |
| 2010 | 11 |
| 2011 | 7 |
| 2012 | 23 |
| 2013 | 9 |
| 2014 | 13 |
| 2015 | 33 |
| 2016 | 21 |
| 2017 | 48 |
| 2018 | 16 |
| 2019 | 34 |
| 2020 | 46 |
| 2021 | 30 |
| 2022 | 64 |
| 2023 | 60 |
| 2024 | 60 |