| Year | Count |
|---|---|
| 1929 | 5 |
| 1930 | 5 |
| 1934 | 7 |
| 1936 | 26 |
| 1939 | 6 |
| 1940 | 5 |
| 1942 | 9 |
| 1943 | 18 |
| 1946 | 6 |
| 1947 | 46 |
| 1948 | 12 |
| 1949 | 16 |
| 1950 | 25 |
| 1951 | 60 |
| 1952 | 5 |
| 1953 | 28 |
| 1954 | 66 |
| 1955 | 63 |
| 1956 | 67 |
| 1957 | 94 |
| 1958 | 91 |
| 1959 | 111 |
| 1960 | 128 |
| 1961 | 17 |
| 1962 | 55 |
| 1963 | 66 |
| 1964 | 46 |
| 1965 | 67 |
| 1966 | 25 |
| 1967 | 5 |
| 1968 | 21 |
| 1969 | 19 |
| 1970 | 11 |
| 1971 | 16 |
| 1972 | 10 |
| 1993 | 5 |
| 1999 | 5 |