| Year | Count |
|---|---|
| 1969 | 6 |
| 1971 | 5 |
| 1973 | 5 |
| 1981 | 5 |
| 1982 | 5 |
| 1984 | 5 |
| 1985 | 6 |
| 1987 | 10 |
| 1988 | 7 |
| 1989 | 10 |
| 1989 | 5 |
| 1990 | 8 |
| 1991 | 10 |
| 1992 | 5 |
| 1995 | 6 |
| 1995 | 6 |
| 1997 | 5 |
| 2003 | 6 |
| 2004 | 5 |
| 2006 | 5 |
| 2007 | 7 |
| 2009 | 5 |
| 2010 | 6 |
| 2010 | 7 |
| 2011 | 8 |
| 2011 | 6 |
| 2014 | 7 |
| 2016 | 12 |
| 2018 | 14 |
| 2019 | 16 |
| 2020 | 10 |
| 2020 | 6 |
| 2021 | 18 |
| 2021 | 5 |
| 2022 | 12 |
| 2023 | 28 |
| 2023 | 10 |
| 2024 | 20 |
| 2024 | 5 |