| Year | Count |
|---|---|
| 1954 | 15 |
| 1974 | 11 |
| 1975 | 23 |
| 1976 | 36 |
| 1977 | 52 |
| 1978 | 27 |
| 1979 | 25 |
| 1980 | 5 |
| 1981 | 6 |
| 1982 | 5 |
| 1983 | 22 |
| 1984 | 31 |
| 1985 | 26 |
| 1986 | 24 |
| 1987 | 27 |
| 1988 | 20 |
| 1989 | 38 |
| 1990 | 32 |
| 1992 | 11 |
| 1993 | 39 |
| 1994 | 17 |
| 1995 | 7 |
| 1996 | 29 |
| 1998 | 18 |
| 1999 | 15 |
| 2001 | 22 |
| 2002 | 22 |
| 2003 | 25 |
| 2004 | 10 |
| 2005 | 17 |
| 2009 | 16 |
| 2010 | 10 |
| 2011 | 5 |
| 2012 | 10 |