| Year | Count |
|---|---|
| 1915 | 5 |
| 1925 | 6 |
| 1926 | 5 |
| 1927 | 5 |
| 1929 | 6 |
| 1933 | 5 |
| 1934 | 5 |
| 1937 | 10 |
| 1939 | 27 |
| 1940 | 56 |
| 1941 | 57 |
| 1942 | 38 |
| 1943 | 59 |
| 1944 | 65 |
| 1945 | 76 |
| 1946 | 62 |
| 1947 | 125 |
| 1948 | 41 |
| 1949 | 63 |
| 1950 | 52 |
| 1951 | 26 |
| 1952 | 71 |
| 1953 | 52 |
| 1954 | 34 |
| 1955 | 71 |
| 1956 | 34 |
| 1957 | 32 |
| 1958 | 36 |
| 1959 | 47 |
| 1960 | 42 |
| 1961 | 55 |
| 1962 | 40 |
| 1963 | 25 |
| 1964 | 24 |
| 1965 | 29 |
| 1966 | 14 |
| 1968 | 20 |
| 1969 | 8 |
| 1970 | 6 |
| 1971 | 15 |
| 1972 | 29 |
| 1974 | 17 |
| 1975 | 5 |
| 1977 | 6 |
| 1978 | 6 |
| 1982 | 5 |
| 1984 | 5 |
| 1985 | 24 |
| 1986 | 14 |
| 1987 | 5 |
| 1989 | 12 |
| 1990 | 5 |
| 1993 | 10 |
| 1996 | 14 |
| 1999 | 10 |