| Year | Count |
|---|---|
| 1943 | 5 |
| 1944 | 15 |
| 1945 | 22 |
| 1946 | 26 |
| 1947 | 23 |
| 1948 | 14 |
| 1949 | 31 |
| 1950 | 71 |
| 1951 | 127 |
| 1952 | 231 |
| 1953 | 262 |
| 1954 | 364 |
| 1955 | 365 |
| 1956 | 627 |
| 1957 | 644 |
| 1958 | 761 |
| 1959 | 1,004 |
| 1960 | 1,360 |
| 1961 | 1,316 |
| 1962 | 1,299 |
| 1963 | 1,152 |
| 1964 | 993 |
| 1965 | 860 |
| 1966 | 768 |
| 1967 | 692 |
| 1968 | 649 |
| 1969 | 749 |
| 1970 | 632 |
| 1971 | 569 |
| 1972 | 423 |
| 1973 | 352 |
| 1974 | 330 |
| 1975 | 288 |
| 1976 | 163 |
| 1977 | 164 |
| 1978 | 88 |
| 1979 | 92 |
| 1980 | 50 |
| 1981 | 66 |
| 1982 | 43 |
| 1983 | 13 |
| 1984 | 11 |
| 1986 | 10 |
| 1987 | 12 |
| 1990 | 5 |
| 1991 | 5 |
| 1995 | 7 |
| 2000 | 10 |