| Year | Count |
|---|---|
| 1921 | 11 |
| 1923 | 10 |
| 1924 | 6 |
| 1925 | 35 |
| 1926 | 88 |
| 1927 | 98 |
| 1928 | 66 |
| 1929 | 76 |
| 1930 | 81 |
| 1931 | 42 |
| 1932 | 59 |
| 1933 | 61 |
| 1934 | 92 |
| 1935 | 62 |
| 1936 | 40 |
| 1937 | 38 |
| 1938 | 34 |
| 1939 | 58 |
| 1940 | 53 |
| 1941 | 30 |
| 1942 | 69 |
| 1943 | 86 |
| 1944 | 30 |
| 1945 | 68 |
| 1946 | 90 |
| 1947 | 70 |
| 1948 | 117 |
| 1949 | 348 |
| 1950 | 245 |
| 1951 | 217 |
| 1952 | 159 |
| 1953 | 148 |
| 1954 | 145 |
| 1955 | 166 |
| 1956 | 108 |
| 1957 | 168 |
| 1958 | 116 |
| 1959 | 138 |
| 1960 | 106 |
| 1961 | 55 |
| 1962 | 63 |
| 1963 | 37 |
| 1964 | 68 |
| 1965 | 18 |
| 1966 | 23 |
| 1967 | 29 |
| 1968 | 46 |
| 1969 | 43 |
| 1970 | 29 |
| 1971 | 8 |
| 1972 | 23 |
| 1973 | 6 |
| 1974 | 5 |