| Year | Count |
|---|---|
| 1917 | 20 |
| 1919 | 5 |
| 1920 | 5 |
| 1921 | 5 |
| 1926 | 8 |
| 1928 | 5 |
| 1932 | 5 |
| 1934 | 10 |
| 1935 | 14 |
| 1937 | 8 |
| 1938 | 16 |
| 1940 | 19 |
| 1941 | 39 |
| 1942 | 32 |
| 1943 | 30 |
| 1944 | 17 |
| 1945 | 24 |
| 1946 | 44 |
| 1947 | 18 |
| 1948 | 19 |
| 1949 | 28 |
| 1950 | 34 |
| 1951 | 7 |
| 1952 | 9 |
| 1953 | 5 |
| 1954 | 11 |
| 1955 | 5 |
| 1956 | 5 |
| 1957 | 5 |
| 1958 | 30 |
| 1959 | 15 |
| 1960 | 43 |
| 1961 | 11 |
| 1962 | 11 |
| 1963 | 15 |
| 1964 | 5 |
| 1965 | 13 |
| 1966 | 5 |
| 1986 | 5 |
| 1987 | 10 |
| 2011 | 7 |