| Year | Count |
|---|---|
| 1941 | 5 |
| 1952 | 5 |
| 1959 | 12 |
| 1960 | 14 |
| 1964 | 6 |
| 1971 | 5 |
| 1973 | 11 |
| 1974 | 6 |
| 1976 | 12 |
| 1977 | 14 |
| 1978 | 10 |
| 1979 | 12 |
| 1981 | 5 |
| 1982 | 7 |
| 1983 | 7 |
| 1984 | 13 |
| 1985 | 6 |
| 1986 | 6 |
| 1987 | 7 |
| 1988 | 26 |
| 1989 | 7 |
| 1990 | 13 |
| 1991 | 6 |
| 1992 | 8 |
| 2000 | 14 |
| 2001 | 10 |
| 2006 | 18 |
| 2009 | 17 |
| 2010 | 15 |
| 2011 | 8 |
| 2012 | 17 |
| 2013 | 13 |
| 2014 | 34 |
| 2015 | 51 |
| 2016 | 70 |
| 2017 | 59 |
| 2018 | 53 |
| 2019 | 93 |
| 2020 | 129 |
| 2021 | 232 |
| 2022 | 235 |
| 2023 | 295 |
| 2024 | 315 |