| Year | Count |
|---|---|
| 1972 | 7 |
| 1974 | 7 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 19 |
| 1978 | 5 |
| 1979 | 6 |
| 1980 | 6 |
| 1981 | 7 |
| 1982 | 5 |
| 1988 | 6 |
| 1989 | 5 |
| 1992 | 15 |
| 1994 | 5 |
| 1995 | 10 |
| 2002 | 9 |
| 2006 | 12 |
| 2007 | 6 |
| 2009 | 11 |
| 2010 | 12 |
| 2011 | 19 |
| 2012 | 33 |
| 2013 | 12 |
| 2014 | 38 |
| 2015 | 28 |
| 2016 | 62 |
| 2017 | 47 |
| 2018 | 58 |
| 2019 | 51 |
| 2020 | 33 |
| 2021 | 19 |
| 2022 | 7 |
| 2023 | 31 |
| 2024 | 37 |