| Year | Count |
|---|---|
| 1925 | 10 |
| 1926 | 16 |
| 1927 | 14 |
| 1929 | 10 |
| 1932 | 7 |
| 1935 | 5 |
| 1936 | 5 |
| 1937 | 5 |
| 1938 | 7 |
| 1939 | 7 |
| 1940 | 11 |
| 1941 | 8 |
| 1942 | 8 |
| 1943 | 9 |
| 1944 | 6 |
| 1945 | 10 |
| 1946 | 12 |
| 1947 | 14 |
| 1950 | 17 |
| 1951 | 12 |
| 1952 | 14 |
| 1953 | 6 |
| 1954 | 18 |
| 1955 | 6 |
| 1956 | 12 |
| 1957 | 22 |
| 1958 | 34 |
| 1959 | 22 |
| 1960 | 42 |
| 1961 | 38 |
| 1963 | 15 |
| 1964 | 17 |
| 1965 | 25 |
| 1966 | 15 |
| 1967 | 23 |
| 1968 | 14 |
| 1969 | 11 |
| 1970 | 8 |
| 1971 | 8 |
| 1972 | 6 |
| 1973 | 6 |
| 1974 | 11 |
| 1975 | 6 |
| 1978 | 14 |
| 1982 | 5 |
| 2002 | 5 |