| Year | Count |
|---|---|
| 1951 | 7 |
| 1952 | 7 |
| 1953 | 6 |
| 1954 | 5 |
| 1955 | 13 |
| 1956 | 10 |
| 1957 | 10 |
| 1958 | 20 |
| 1959 | 10 |
| 1960 | 14 |
| 1961 | 26 |
| 1962 | 10 |
| 1963 | 10 |
| 1964 | 6 |
| 1965 | 17 |
| 1967 | 12 |
| 1968 | 17 |
| 1970 | 6 |
| 1971 | 8 |
| 1972 | 8 |
| 1975 | 6 |
| 1976 | 18 |
| 1981 | 6 |
| 1988 | 18 |
| 1990 | 32 |
| 1993 | 5 |
| 1994 | 5 |
| 1997 | 5 |
| 1998 | 12 |
| 1999 | 10 |
| 2003 | 19 |
| 2004 | 10 |
| 2005 | 18 |
| 2006 | 5 |
| 2008 | 8 |
| 2009 | 6 |
| 2010 | 7 |
| 2011 | 13 |
| 2012 | 14 |
| 2015 | 7 |
| 2016 | 11 |
| 2017 | 14 |
| 2018 | 20 |
| 2019 | 6 |
| 2020 | 5 |
| 2021 | 21 |
| 2022 | 9 |
| 2023 | 34 |
| 2024 | 29 |