| Year | Count |
|---|---|
| 1933 | 9 |
| 1947 | 33 |
| 1948 | 10 |
| 1949 | 10 |
| 1950 | 12 |
| 1951 | 22 |
| 1952 | 21 |
| 1954 | 15 |
| 1955 | 14 |
| 1956 | 29 |
| 1957 | 35 |
| 1958 | 6 |
| 1959 | 58 |
| 1960 | 36 |
| 1961 | 33 |
| 1962 | 52 |
| 1963 | 18 |
| 1964 | 17 |
| 1965 | 48 |
| 1966 | 29 |
| 1967 | 37 |
| 1968 | 18 |
| 1969 | 40 |
| 1970 | 74 |
| 1971 | 92 |
| 1972 | 78 |
| 1973 | 84 |
| 1974 | 119 |
| 1975 | 88 |
| 1976 | 91 |
| 1977 | 89 |
| 1978 | 123 |
| 1979 | 126 |
| 1980 | 93 |
| 1981 | 133 |
| 1982 | 131 |
| 1983 | 3,179 |
| 1984 | 1,799 |
| 1985 | 709 |
| 1986 | 565 |
| 1987 | 465 |
| 1988 | 366 |
| 1989 | 379 |
| 1989 | 6 |
| 1990 | 312 |
| 1991 | 375 |
| 1992 | 284 |
| 1993 | 307 |
| 1994 | 171 |
| 1995 | 68 |
| 1996 | 55 |
| 1997 | 48 |
| 1998 | 36 |
| 1999 | 19 |
| 2000 | 10 |
| 2003 | 10 |