| Year | Count |
|---|---|
| 1914 | 15 |
| 1919 | 21 |
| 1920 | 15 |
| 1921 | 10 |
| 1938 | 9 |
| 1940 | 5 |
| 1941 | 10 |
| 1942 | 13 |
| 1943 | 34 |
| 1944 | 27 |
| 1945 | 51 |
| 1946 | 55 |
| 1947 | 171 |
| 1948 | 120 |
| 1949 | 166 |
| 1950 | 239 |
| 1951 | 186 |
| 1952 | 241 |
| 1953 | 232 |
| 1954 | 218 |
| 1955 | 196 |
| 1956 | 275 |
| 1957 | 201 |
| 1958 | 175 |
| 1959 | 124 |
| 1960 | 98 |
| 1961 | 55 |
| 1962 | 61 |
| 1963 | 76 |
| 1964 | 8 |
| 1965 | 20 |
| 1966 | 81 |
| 1967 | 30 |
| 1968 | 6 |
| 1969 | 26 |
| 1970 | 7 |
| 1971 | 16 |
| 1973 | 6 |
| 1975 | 5 |