| Year | Count |
|---|---|
| 1974 | 14 |
| 1975 | 12 |
| 1976 | 16 |
| 1977 | 14 |
| 1978 | 16 |
| 1979 | 12 |
| 1980 | 18 |
| 1981 | 22 |
| 1982 | 22 |
| 1983 | 24 |
| 1984 | 12 |
| 1985 | 20 |
| 1986 | 10 |
| 1987 | 26 |
| 1988 | 18 |
| 1989 | 14 |
| 1990 | 14 |
| 1991 | 14 |
| 1992 | 24 |
| 1993 | 18 |
| 1994 | 28 |
| 1995 | 22 |
| 1996 | 14 |
| 1997 | 14 |
| 1998 | 10 |
| 2000 | 12 |
| 2001 | 20 |
| 2002 | 14 |
| 2006 | 10 |
| 2007 | 16 |
| 2008 | 18 |
| 2012 | 12 |
| 2014 | 10 |
| 2018 | 10 |
| 2023 | 14 |