| Year | Count |
|---|---|
| 1947 | 10 |
| 1948 | 11 |
| 1949 | 5 |
| 1950 | 5 |
| 1951 | 7 |
| 1957 | 13 |
| 1958 | 6 |
| 1959 | 6 |
| 1960 | 6 |
| 1961 | 10 |
| 1962 | 5 |
| 1963 | 7 |
| 1965 | 7 |
| 1967 | 5 |
| 1968 | 5 |
| 1971 | 5 |
| 1972 | 8 |
| 1974 | 5 |
| 1976 | 5 |
| 1983 | 6 |
| 1993 | 5 |
| 2004 | 5 |
| 2008 | 6 |
| 2010 | 6 |
| 2012 | 5 |
| 2013 | 6 |
| 2014 | 5 |
| 2015 | 9 |
| 2016 | 20 |
| 2017 | 20 |
| 2018 | 20 |
| 2019 | 32 |
| 2020 | 9 |
| 2021 | 12 |
| 2022 | 7 |
| 2023 | 15 |
| 2024 | 12 |