| Year | Count |
|---|---|
| 1921 | 5 |
| 1925 | 11 |
| 1927 | 17 |
| 1928 | 22 |
| 1929 | 25 |
| 1930 | 61 |
| 1931 | 75 |
| 1932 | 67 |
| 1933 | 90 |
| 1934 | 124 |
| 1935 | 135 |
| 1936 | 107 |
| 1937 | 118 |
| 1938 | 110 |
| 1939 | 168 |
| 1940 | 173 |
| 1941 | 203 |
| 1942 | 254 |
| 1943 | 159 |
| 1944 | 162 |
| 1945 | 137 |
| 1946 | 110 |
| 1947 | 208 |
| 1948 | 112 |
| 1949 | 154 |
| 1950 | 119 |
| 1951 | 86 |
| 1952 | 102 |
| 1953 | 147 |
| 1954 | 109 |
| 1955 | 99 |
| 1956 | 95 |
| 1957 | 112 |
| 1958 | 65 |
| 1959 | 56 |
| 1960 | 106 |
| 1961 | 49 |
| 1962 | 70 |
| 1963 | 65 |
| 1964 | 50 |
| 1965 | 70 |
| 1966 | 45 |
| 1967 | 35 |
| 1968 | 32 |
| 1969 | 46 |
| 1970 | 21 |
| 1971 | 23 |
| 1972 | 18 |
| 1974 | 12 |
| 1976 | 6 |
| 1981 | 21 |
| 1984 | 6 |
| 1990 | 5 |