| Year | Count |
|---|---|
| 1932 | 15 |
| 1934 | 37 |
| 1935 | 43 |
| 1936 | 9 |
| 1937 | 30 |
| 1938 | 32 |
| 1939 | 46 |
| 1940 | 46 |
| 1941 | 50 |
| 1942 | 36 |
| 1943 | 40 |
| 1944 | 48 |
| 1945 | 30 |
| 1946 | 55 |
| 1947 | 85 |
| 1948 | 74 |
| 1949 | 125 |
| 1950 | 115 |
| 1951 | 158 |
| 1952 | 225 |
| 1953 | 1,640 |
| 1954 | 2,109 |
| 1955 | 1,694 |
| 1956 | 1,543 |
| 1957 | 1,231 |
| 1958 | 1,151 |
| 1959 | 1,033 |
| 1960 | 898 |
| 1961 | 935 |
| 1962 | 563 |
| 1963 | 529 |
| 1964 | 455 |
| 1965 | 359 |
| 1966 | 209 |
| 1967 | 195 |
| 1968 | 214 |
| 1969 | 170 |
| 1970 | 130 |
| 1971 | 95 |
| 1972 | 38 |
| 1973 | 54 |
| 1974 | 29 |
| 1975 | 28 |
| 1976 | 9 |
| 1977 | 20 |
| 1978 | 5 |
| 1985 | 15 |
| 1987 | 5 |
| 1988 | 5 |
| 2012 | 5 |
| 2022 | 5 |