| Year | Count |
|---|---|
| 1959 | 10 |
| 1960 | 46 |
| 1961 | 5 |
| 1963 | 5 |
| 1967 | 7 |
| 1973 | 15 |
| 1974 | 15 |
| 1976 | 7 |
| 1978 | 15 |
| 1979 | 6 |
| 1980 | 9 |
| 1981 | 11 |
| 1984 | 6 |
| 1985 | 12 |
| 1987 | 20 |
| 1989 | 6 |
| 1995 | 7 |
| 1996 | 8 |
| 1997 | 9 |
| 1998 | 13 |
| 2004 | 24 |
| 2005 | 48 |
| 2006 | 20 |
| 2007 | 11 |
| 2008 | 60 |
| 2010 | 17 |
| 2011 | 15 |
| 2015 | 14 |
| 2016 | 16 |
| 2017 | 13 |
| 2018 | 12 |
| 2019 | 25 |
| 2020 | 30 |
| 2021 | 12 |
| 2022 | 25 |
| 2023 | 26 |
| 2024 | 19 |