| Year | Count |
|---|---|
| 1930 | 8 |
| 1935 | 6 |
| 1937 | 5 |
| 1939 | 15 |
| 1940 | 5 |
| 1941 | 5 |
| 1943 | 6 |
| 1944 | 17 |
| 1947 | 10 |
| 1948 | 11 |
| 1950 | 37 |
| 1951 | 27 |
| 1952 | 10 |
| 1953 | 18 |
| 1954 | 21 |
| 1955 | 25 |
| 1956 | 30 |
| 1957 | 26 |
| 1958 | 9 |
| 1959 | 18 |
| 1960 | 34 |
| 1962 | 36 |
| 1963 | 42 |
| 1964 | 37 |
| 1965 | 38 |
| 1966 | 15 |
| 1967 | 10 |
| 1968 | 12 |
| 1969 | 10 |
| 1974 | 10 |
| 1983 | 10 |
| 1990 | 28 |
| 1994 | 15 |