| Year | Count |
|---|---|
| 1952 | 7 |
| 1960 | 10 |
| 1964 | 5 |
| 1966 | 6 |
| 1968 | 5 |
| 1970 | 6 |
| 1974 | 9 |
| 1976 | 10 |
| 1977 | 10 |
| 1978 | 12 |
| 1981 | 9 |
| 1984 | 6 |
| 1985 | 16 |
| 1986 | 7 |
| 1987 | 25 |
| 1988 | 17 |
| 1989 | 14 |
| 1990 | 6 |
| 1991 | 7 |
| 1992 | 8 |
| 1993 | 6 |
| 1994 | 19 |
| 1995 | 24 |
| 1996 | 30 |
| 1997 | 28 |
| 1998 | 7 |
| 2002 | 5 |
| 2003 | 17 |
| 2004 | 5 |
| 2005 | 38 |
| 2006 | 7 |
| 2007 | 5 |
| 2009 | 6 |
| 2010 | 12 |
| 2011 | 23 |
| 2013 | 5 |
| 2015 | 31 |
| 2016 | 23 |
| 2019 | 6 |
| 2020 | 6 |
| 2021 | 11 |
| 2022 | 26 |
| 2023 | 35 |
| 2024 | 6 |