| Year | Count |
|---|---|
| 1933 | 15 |
| 1934 | 5 |
| 1935 | 15 |
| 1936 | 5 |
| 1938 | 7 |
| 1939 | 14 |
| 1940 | 13 |
| 1942 | 22 |
| 1943 | 24 |
| 1945 | 5 |
| 1948 | 12 |
| 1949 | 15 |
| 1951 | 51 |
| 1953 | 23 |
| 1954 | 42 |
| 1955 | 13 |
| 1956 | 11 |
| 1957 | 39 |
| 1958 | 18 |
| 1959 | 15 |
| 1960 | 27 |
| 1961 | 23 |
| 1962 | 29 |
| 1963 | 15 |
| 1964 | 6 |
| 1965 | 5 |
| 1966 | 20 |
| 1967 | 37 |
| 1968 | 14 |
| 1969 | 5 |
| 1971 | 19 |
| 1972 | 17 |
| 1973 | 15 |
| 1975 | 13 |
| 1976 | 18 |
| 1978 | 16 |
| 1979 | 11 |
| 1980 | 12 |
| 1990 | 10 |
| 1993 | 10 |
| 1995 | 12 |