| Year | Count |
|---|---|
| 1941 | 5 |
| 1947 | 5 |
| 1955 | 8 |
| 1965 | 5 |
| 1966 | 5 |
| 1971 | 5 |
| 1978 | 5 |
| 1980 | 7 |
| 1981 | 5 |
| 1986 | 8 |
| 1987 | 10 |
| 1988 | 11 |
| 1989 | 9 |
| 1991 | 6 |
| 1992 | 8 |
| 1994 | 8 |
| 1995 | 6 |
| 1998 | 5 |
| 2009 | 5 |
| 2010 | 10 |
| 2012 | 5 |
| 2013 | 6 |
| 2014 | 7 |
| 2015 | 9 |
| 2016 | 24 |
| 2017 | 18 |
| 2018 | 28 |
| 2019 | 24 |
| 2020 | 13 |
| 2021 | 14 |
| 2022 | 20 |
| 2023 | 12 |
| 2024 | 9 |