| Year | Count |
|---|---|
| 1941 | 5 |
| 1942 | 17 |
| 1943 | 18 |
| 1944 | 12 |
| 1945 | 15 |
| 1946 | 24 |
| 1947 | 19 |
| 1948 | 27 |
| 1949 | 31 |
| 1950 | 20 |
| 1951 | 24 |
| 1952 | 10 |
| 1953 | 19 |
| 1954 | 26 |
| 1955 | 52 |
| 1956 | 29 |
| 1957 | 50 |
| 1958 | 34 |
| 1959 | 26 |
| 1960 | 40 |
| 1961 | 24 |
| 1962 | 12 |
| 1963 | 14 |
| 1964 | 11 |
| 1965 | 8 |
| 1966 | 12 |
| 1967 | 11 |
| 1968 | 17 |
| 1969 | 6 |
| 1970 | 13 |
| 1971 | 9 |
| 1972 | 8 |
| 1977 | 20 |
| 1978 | 24 |
| 1979 | 16 |
| 1984 | 7 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 8 |
| 1993 | 6 |
| 1995 | 6 |
| 2003 | 8 |
| 2004 | 7 |
| 2005 | 7 |
| 2005 | 5 |
| 2006 | 5 |
| 2007 | 5 |
| 2008 | 7 |