| Year | Count |
|---|---|
| 1954 | 7 |
| 1956 | 6 |
| 1957 | 6 |
| 1958 | 10 |
| 1960 | 6 |
| 1963 | 12 |
| 1968 | 5 |
| 1969 | 16 |
| 1970 | 42 |
| 1971 | 48 |
| 1972 | 43 |
| 1973 | 53 |
| 1974 | 54 |
| 1975 | 29 |
| 1976 | 41 |
| 1977 | 55 |
| 1978 | 50 |
| 1979 | 49 |
| 1980 | 38 |
| 1981 | 56 |
| 1982 | 41 |
| 1983 | 47 |
| 1984 | 80 |
| 1985 | 96 |
| 1986 | 41 |
| 1987 | 74 |
| 1988 | 56 |
| 1989 | 40 |
| 1990 | 36 |
| 1991 | 5 |
| 1992 | 55 |
| 1993 | 5 |
| 1994 | 10 |
| 1995 | 33 |
| 1996 | 18 |
| 1997 | 34 |
| 1998 | 19 |
| 1999 | 27 |
| 2001 | 5 |
| 2002 | 16 |
| 2003 | 27 |
| 2004 | 18 |
| 2006 | 7 |
| 2007 | 6 |
| 2008 | 7 |
| 2009 | 15 |
| 2010 | 5 |
| 2011 | 7 |
| 2012 | 21 |
| 2013 | 5 |
| 2014 | 6 |
| 2016 | 6 |
| 2017 | 6 |
| 2020 | 11 |
| 2022 | 5 |
| 2023 | 6 |