| Year | Count |
|---|---|
| 1950 | 5 |
| 1952 | 5 |
| 1953 | 13 |
| 1954 | 8 |
| 1955 | 11 |
| 1956 | 14 |
| 1957 | 16 |
| 1958 | 32 |
| 1959 | 24 |
| 1960 | 20 |
| 1961 | 46 |
| 1962 | 10 |
| 1963 | 18 |
| 1965 | 12 |
| 1966 | 15 |
| 1967 | 20 |
| 1968 | 19 |
| 1969 | 41 |
| 1970 | 32 |
| 1971 | 40 |
| 1972 | 28 |
| 1973 | 34 |
| 1974 | 66 |
| 1975 | 55 |
| 1976 | 49 |
| 1977 | 27 |
| 1978 | 31 |
| 1979 | 35 |
| 1980 | 40 |
| 1981 | 35 |
| 1982 | 27 |
| 1983 | 25 |
| 1984 | 21 |
| 1985 | 69 |
| 1986 | 36 |
| 1987 | 34 |
| 1988 | 30 |
| 1989 | 6 |
| 1990 | 20 |
| 1992 | 50 |
| 1993 | 13 |
| 1994 | 10 |
| 1995 | 5 |
| 1996 | 35 |
| 1997 | 21 |
| 1998 | 29 |
| 2000 | 6 |
| 2001 | 41 |
| 2003 | 10 |
| 2004 | 20 |
| 2005 | 53 |
| 2006 | 23 |
| 2007 | 6 |
| 2009 | 5 |
| 2011 | 5 |
| 2012 | 5 |
| 2014 | 6 |
| 2015 | 5 |
| 2016 | 7 |
| 2017 | 5 |
| 2021 | 10 |