| Year | Count |
|---|---|
| 1916 | 7 |
| 1917 | 6 |
| 1918 | 5 |
| 1919 | 6 |
| 1920 | 5 |
| 1921 | 9 |
| 1924 | 16 |
| 1926 | 43 |
| 1928 | 10 |
| 1931 | 6 |
| 1937 | 8 |
| 1938 | 5 |
| 1939 | 8 |
| 1940 | 6 |
| 1942 | 10 |
| 1943 | 7 |
| 1944 | 11 |
| 1946 | 8 |
| 1947 | 14 |
| 1948 | 12 |
| 1949 | 25 |
| 1950 | 11 |
| 1951 | 19 |
| 1952 | 21 |
| 1953 | 6 |
| 1954 | 12 |
| 1955 | 5 |
| 1957 | 6 |
| 1958 | 21 |
| 1959 | 24 |
| 1960 | 30 |
| 1961 | 25 |
| 1962 | 24 |
| 1963 | 15 |
| 1964 | 8 |
| 1965 | 9 |
| 1966 | 5 |
| 1976 | 8 |
| 1983 | 5 |
| 1984 | 5 |
| 1988 | 6 |
| 1990 | 7 |
| 1994 | 5 |
| 1995 | 5 |
| 1997 | 7 |
| 2000 | 6 |
| 2001 | 7 |