| Year | Count |
|---|---|
| 1955 | 5 |
| 1957 | 8 |
| 1965 | 5 |
| 1967 | 5 |
| 1970 | 7 |
| 1971 | 6 |
| 1972 | 5 |
| 1973 | 6 |
| 1975 | 5 |
| 1977 | 9 |
| 1978 | 8 |
| 1980 | 6 |
| 1982 | 6 |
| 1990 | 5 |
| 1994 | 6 |
| 1996 | 7 |
| 2000 | 6 |
| 2001 | 6 |
| 2002 | 5 |
| 2003 | 5 |
| 2009 | 9 |
| 2010 | 7 |
| 2012 | 9 |
| 2013 | 8 |
| 2014 | 12 |
| 2015 | 11 |
| 2016 | 42 |
| 2017 | 50 |
| 2018 | 72 |
| 2019 | 68 |
| 2020 | 40 |
| 2021 | 47 |
| 2022 | 36 |
| 2023 | 44 |
| 2024 | 38 |