| Year | Count |
|---|---|
| 1915 | 5 |
| 1916 | 15 |
| 1922 | 6 |
| 1928 | 5 |
| 1940 | 5 |
| 1950 | 16 |
| 1951 | 5 |
| 1952 | 18 |
| 1953 | 8 |
| 1954 | 36 |
| 1955 | 51 |
| 1956 | 68 |
| 1957 | 50 |
| 1958 | 66 |
| 1959 | 132 |
| 1960 | 160 |
| 1961 | 246 |
| 1962 | 196 |
| 1963 | 170 |
| 1964 | 171 |
| 1965 | 199 |
| 1966 | 200 |
| 1967 | 199 |
| 1968 | 130 |
| 1969 | 149 |
| 1970 | 160 |
| 1971 | 193 |
| 1972 | 125 |
| 1973 | 59 |
| 1974 | 43 |
| 1975 | 19 |
| 1976 | 5 |
| 1977 | 17 |
| 1978 | 12 |
| 1979 | 6 |
| 1981 | 5 |
| 1982 | 5 |