| Year | Count |
|---|---|
| 1967 | 5 |
| 1971 | 5 |
| 1972 | 7 |
| 1975 | 26 |
| 1976 | 8 |
| 1977 | 19 |
| 1978 | 41 |
| 1979 | 37 |
| 1980 | 14 |
| 1981 | 32 |
| 1982 | 46 |
| 1983 | 19 |
| 1984 | 5 |
| 1985 | 49 |
| 1987 | 12 |
| 1988 | 7 |
| 1991 | 5 |
| 1995 | 5 |
| 1997 | 18 |
| 2003 | 10 |
| 2005 | 10 |
| 2009 | 12 |
| 2010 | 5 |
| 2012 | 14 |
| 2014 | 5 |
| 2015 | 12 |
| 2016 | 6 |
| 2018 | 10 |
| 2019 | 16 |
| 2020 | 15 |
| 2022 | 7 |
| 2023 | 10 |
| 2024 | 17 |