| Year | Count |
|---|---|
| 1919 | 5 |
| 1923 | 5 |
| 1924 | 11 |
| 1925 | 12 |
| 1929 | 11 |
| 1930 | 10 |
| 1933 | 18 |
| 1934 | 6 |
| 1935 | 10 |
| 1936 | 6 |
| 1937 | 5 |
| 1937 | 7 |
| 1938 | 27 |
| 1939 | 20 |
| 1940 | 93 |
| 1941 | 35 |
| 1942 | 22 |
| 1943 | 34 |
| 1944 | 23 |
| 1945 | 25 |
| 1946 | 38 |
| 1947 | 66 |
| 1948 | 34 |
| 1949 | 50 |
| 1950 | 38 |
| 1951 | 25 |
| 1952 | 8 |
| 1953 | 14 |
| 1954 | 33 |
| 1955 | 97 |
| 1956 | 62 |
| 1957 | 60 |
| 1958 | 57 |
| 1959 | 64 |
| 1960 | 50 |
| 1961 | 5 |
| 1962 | 60 |
| 1963 | 43 |
| 1964 | 41 |
| 1965 | 47 |
| 1966 | 30 |
| 1967 | 31 |
| 1968 | 25 |
| 1969 | 15 |
| 1970 | 12 |
| 1971 | 12 |
| 1972 | 19 |
| 1973 | 16 |
| 1974 | 6 |
| 1975 | 13 |
| 1976 | 6 |
| 1977 | 15 |
| 1978 | 7 |
| 1979 | 5 |
| 1980 | 22 |
| 1981 | 8 |
| 1982 | 9 |
| 1983 | 7 |
| 1988 | 7 |
| 1990 | 5 |
| 1998 | 5 |