| Year | Count |
|---|---|
| 1950 | 5 |
| 1953 | 6 |
| 1955 | 9 |
| 1956 | 5 |
| 1957 | 28 |
| 1958 | 20 |
| 1959 | 10 |
| 1960 | 14 |
| 1961 | 5 |
| 1962 | 12 |
| 1963 | 9 |
| 1964 | 9 |
| 1965 | 9 |
| 1967 | 5 |
| 1968 | 5 |
| 1969 | 8 |
| 1971 | 6 |
| 1972 | 5 |
| 1973 | 6 |
| 1978 | 10 |
| 1979 | 20 |
| 1982 | 6 |
| 1985 | 6 |
| 1989 | 5 |
| 1991 | 5 |
| 1995 | 7 |
| 1996 | 7 |
| 2003 | 6 |
| 2007 | 7 |
| 2008 | 6 |
| 2009 | 5 |
| 2010 | 5 |
| 2011 | 5 |
| 2012 | 5 |
| 2013 | 8 |
| 2014 | 6 |
| 2015 | 21 |
| 2016 | 30 |
| 2017 | 27 |
| 2018 | 15 |
| 2019 | 14 |
| 2020 | 26 |
| 2021 | 32 |
| 2022 | 32 |
| 2023 | 28 |
| 2024 | 34 |