| Year | Count |
|---|---|
| 1915 | 10 |
| 1926 | 10 |
| 1927 | 10 |
| 1931 | 6 |
| 1933 | 6 |
| 1934 | 7 |
| 1935 | 18 |
| 1936 | 11 |
| 1937 | 21 |
| 1938 | 19 |
| 1939 | 27 |
| 1940 | 13 |
| 1941 | 30 |
| 1942 | 34 |
| 1943 | 30 |
| 1944 | 26 |
| 1945 | 38 |
| 1946 | 42 |
| 1947 | 48 |
| 1948 | 60 |
| 1949 | 49 |
| 1950 | 56 |
| 1951 | 59 |
| 1952 | 60 |
| 1953 | 42 |
| 1954 | 57 |
| 1955 | 57 |
| 1956 | 71 |
| 1957 | 63 |
| 1958 | 65 |
| 1959 | 49 |
| 1960 | 45 |
| 1961 | 59 |
| 1962 | 51 |
| 1963 | 40 |
| 1964 | 60 |
| 1965 | 44 |
| 1966 | 35 |
| 1967 | 30 |
| 1968 | 31 |
| 1969 | 26 |
| 1970 | 41 |
| 1971 | 29 |
| 1972 | 30 |
| 1973 | 16 |
| 1974 | 17 |
| 1975 | 25 |
| 1976 | 19 |
| 1977 | 27 |
| 1979 | 19 |
| 1980 | 13 |
| 1981 | 5 |
| 1984 | 6 |
| 1986 | 10 |
| 1991 | 5 |
| 1992 | 6 |
| 1996 | 10 |
| 1998 | 10 |
| 2000 | 5 |
| 2001 | 16 |
| 2007 | 5 |