| Year | Count |
|---|---|
| 1966 | 6 |
| 1967 | 24 |
| 1968 | 35 |
| 1969 | 34 |
| 1970 | 49 |
| 1971 | 30 |
| 1972 | 28 |
| 1973 | 22 |
| 1974 | 14 |
| 1975 | 10 |
| 1976 | 13 |
| 1977 | 10 |
| 1978 | 18 |
| 1979 | 16 |
| 1983 | 5 |
| 1990 | 5 |
| 1997 | 5 |
| 2002 | 5 |
| 2009 | 7 |
| 2010 | 5 |
| 2010 | 6 |
| 2012 | 9 |
| 2013 | 5 |
| 2014 | 6 |
| 2014 | 8 |
| 2015 | 15 |
| 2015 | 10 |
| 2016 | 14 |
| 2017 | 18 |
| 2018 | 16 |
| 2019 | 10 |
| 2022 | 20 |
| 2023 | 12 |
| 2023 | 5 |