| Year | Count |
|---|---|
| 1928 | 10 |
| 1950 | 125 |
| 1951 | 120 |
| 1952 | 125 |
| 1953 | 113 |
| 1954 | 87 |
| 1955 | 86 |
| 1956 | 93 |
| 1957 | 67 |
| 1958 | 41 |
| 1959 | 64 |
| 1960 | 52 |
| 1961 | 52 |
| 1962 | 180 |
| 1968 | 55 |
| 1969 | 65 |
| 1970 | 65 |
| 1971 | 67 |
| 1972 | 70 |
| 1973 | 51 |
| 1974 | 75 |
| 1975 | 51 |
| 1976 | 73 |
| 1977 | 49 |
| 1978 | 41 |
| 1979 | 54 |
| 1980 | 48 |
| 1981 | 43 |
| 1982 | 23 |
| 1983 | 37 |
| 1984 | 38 |
| 1985 | 96 |
| 1986 | 50 |
| 1987 | 46 |
| 1988 | 52 |
| 1992 | 19 |
| 1996 | 28 |
| 1997 | 23 |
| 1998 | 23 |
| 2001 | 16 |
| 2004 | 22 |
| 2005 | 26 |
| 2006 | 9 |
| 2007 | 10 |