| Year | Count |
|---|---|
| 1936 | 39 |
| 1937 | 44 |
| 1938 | 107 |
| 1939 | 153 |
| 1940 | 278 |
| 1941 | 321 |
| 1942 | 338 |
| 1943 | 373 |
| 1944 | 277 |
| 1945 | 252 |
| 1946 | 273 |
| 1947 | 275 |
| 1948 | 146 |
| 1949 | 49 |
| 1950 | 61 |
| 1951 | 49 |
| 1952 | 28 |
| 1953 | 44 |
| 1954 | 10 |
| 1955 | 13 |
| 1956 | 27 |
| 1957 | 55 |
| 1958 | 50 |
| 1959 | 18 |
| 1960 | 51 |
| 1961 | 39 |
| 1962 | 37 |
| 1963 | 5 |
| 1964 | 7 |
| 1967 | 5 |
| 1970 | 7 |
| 1982 | 5 |