| Year | Count |
|---|---|
| 1922 | 5 |
| 1935 | 10 |
| 1936 | 12 |
| 1937 | 33 |
| 1938 | 44 |
| 1939 | 36 |
| 1940 | 60 |
| 1941 | 57 |
| 1942 | 88 |
| 1943 | 92 |
| 1944 | 58 |
| 1945 | 77 |
| 1946 | 123 |
| 1947 | 111 |
| 1948 | 90 |
| 1949 | 129 |
| 1950 | 131 |
| 1951 | 152 |
| 1952 | 141 |
| 1953 | 176 |
| 1954 | 191 |
| 1955 | 143 |
| 1956 | 155 |
| 1957 | 223 |
| 1958 | 195 |
| 1959 | 192 |
| 1960 | 302 |
| 1961 | 320 |
| 1962 | 218 |
| 1963 | 234 |
| 1964 | 216 |
| 1965 | 133 |
| 1966 | 122 |
| 1967 | 106 |
| 1968 | 107 |
| 1969 | 106 |
| 1970 | 108 |
| 1971 | 70 |
| 1972 | 58 |
| 1973 | 35 |
| 1974 | 44 |
| 1975 | 41 |
| 1976 | 15 |
| 1977 | 45 |
| 1978 | 30 |
| 1979 | 21 |
| 1981 | 12 |
| 1983 | 5 |
| 1984 | 6 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 11 |
| 1988 | 12 |
| 1991 | 5 |
| 1992 | 5 |
| 1997 | 6 |