| Year | Count |
|---|---|
| 1957 | 10 |
| 1959 | 10 |
| 1960 | 21 |
| 1961 | 23 |
| 1962 | 6 |
| 1963 | 9 |
| 1964 | 5 |
| 1965 | 24 |
| 1966 | 12 |
| 1967 | 7 |
| 1968 | 8 |
| 1969 | 10 |
| 1971 | 8 |
| 1975 | 6 |
| 1976 | 10 |
| 1977 | 10 |
| 1983 | 6 |
| 1995 | 5 |
| 1996 | 7 |
| 1997 | 6 |
| 1998 | 21 |
| 2001 | 25 |
| 2002 | 12 |
| 2003 | 31 |
| 2004 | 84 |
| 2005 | 46 |
| 2006 | 31 |
| 2007 | 38 |
| 2008 | 47 |
| 2009 | 8 |
| 2010 | 14 |
| 2011 | 14 |
| 2016 | 10 |
| 2017 | 7 |
| 2018 | 6 |
| 2019 | 6 |
| 2021 | 8 |
| 2022 | 5 |
| 2023 | 8 |