| Year | Count |
|---|---|
| 1936 | 5 |
| 1947 | 9 |
| 1948 | 11 |
| 1949 | 12 |
| 1950 | 15 |
| 1951 | 19 |
| 1952 | 28 |
| 1953 | 26 |
| 1954 | 44 |
| 1955 | 63 |
| 1956 | 68 |
| 1957 | 125 |
| 1958 | 88 |
| 1959 | 108 |
| 1960 | 75 |
| 1961 | 106 |
| 1962 | 14 |
| 1963 | 42 |
| 1964 | 47 |
| 1965 | 37 |
| 1966 | 42 |
| 1967 | 39 |
| 1968 | 17 |
| 1969 | 40 |
| 1970 | 50 |
| 1971 | 35 |
| 1972 | 25 |
| 1973 | 20 |
| 1974 | 59 |
| 1975 | 35 |
| 1976 | 27 |
| 1977 | 30 |
| 1978 | 35 |
| 1979 | 52 |
| 1980 | 29 |
| 1981 | 45 |
| 1982 | 69 |
| 1983 | 36 |
| 1984 | 38 |
| 1985 | 91 |
| 1986 | 43 |
| 1987 | 34 |
| 1988 | 25 |
| 1989 | 28 |
| 1990 | 40 |
| 1991 | 6 |
| 1992 | 29 |
| 1993 | 16 |
| 1994 | 10 |
| 1995 | 6 |
| 1996 | 27 |
| 1997 | 15 |
| 1998 | 55 |
| 1999 | 7 |
| 2001 | 17 |
| 2002 | 7 |
| 2004 | 14 |
| 2005 | 28 |
| 2006 | 19 |
| 2007 | 5 |
| 2015 | 6 |