| Year | Count |
|---|---|
| 1919 | 7 |
| 1920 | 5 |
| 1921 | 6 |
| 1923 | 5 |
| 1925 | 7 |
| 1926 | 16 |
| 1927 | 13 |
| 1928 | 13 |
| 1929 | 12 |
| 1932 | 5 |
| 1937 | 6 |
| 1939 | 6 |
| 1940 | 6 |
| 1941 | 13 |
| 1942 | 7 |
| 1943 | 11 |
| 1944 | 12 |
| 1945 | 12 |
| 1946 | 17 |
| 1947 | 29 |
| 1948 | 19 |
| 1949 | 27 |
| 1951 | 11 |
| 1952 | 9 |
| 1955 | 116 |
| 1956 | 72 |
| 1957 | 50 |
| 1958 | 28 |
| 1959 | 32 |
| 1960 | 26 |
| 1962 | 20 |
| 1963 | 28 |
| 1964 | 26 |
| 1965 | 30 |
| 1966 | 32 |
| 1967 | 14 |
| 1968 | 14 |
| 1969 | 6 |
| 1970 | 17 |
| 1971 | 15 |
| 1972 | 12 |
| 1973 | 18 |
| 1975 | 8 |
| 1976 | 8 |
| 1977 | 12 |
| 1978 | 10 |
| 1979 | 7 |
| 1980 | 12 |
| 1981 | 11 |
| 1982 | 10 |
| 1983 | 7 |
| 1984 | 10 |
| 1985 | 11 |
| 1986 | 14 |
| 1987 | 6 |
| 1989 | 13 |
| 1990 | 13 |
| 1991 | 5 |
| 1992 | 7 |
| 1993 | 13 |
| 1994 | 9 |
| 1995 | 5 |
| 1997 | 6 |
| 2006 | 5 |