| Year | Count |
|---|---|
| 1953 | 7 |
| 1955 | 15 |
| 1956 | 24 |
| 1957 | 34 |
| 1958 | 46 |
| 1959 | 46 |
| 1960 | 26 |
| 1961 | 8 |
| 1962 | 8 |
| 1963 | 9 |
| 1964 | 12 |
| 1965 | 13 |
| 1966 | 7 |
| 1967 | 9 |
| 1969 | 6 |
| 1972 | 5 |
| 1973 | 7 |
| 1977 | 10 |
| 1982 | 5 |
| 1986 | 6 |
| 1988 | 5 |
| 1990 | 5 |
| 1994 | 5 |
| 2001 | 6 |
| 2003 | 14 |
| 2004 | 10 |
| 2005 | 10 |
| 2006 | 5 |
| 2007 | 16 |
| 2008 | 20 |
| 2009 | 13 |
| 2010 | 11 |
| 2011 | 15 |
| 2012 | 8 |
| 2013 | 6 |
| 2014 | 13 |
| 2015 | 27 |
| 2016 | 15 |
| 2017 | 30 |
| 2019 | 10 |
| 2020 | 10 |
| 2021 | 10 |
| 2022 | 12 |
| 2024 | 10 |