| Year | Count |
|---|---|
| 1949 | 12 |
| 1954 | 10 |
| 1955 | 12 |
| 1957 | 10 |
| 1959 | 10 |
| 1960 | 14 |
| 1961 | 14 |
| 1962 | 10 |
| 1964 | 20 |
| 1967 | 14 |
| 1968 | 16 |
| 1970 | 16 |
| 1971 | 10 |
| 1972 | 12 |
| 1974 | 16 |
| 1976 | 20 |
| 1977 | 24 |
| 1978 | 16 |
| 1980 | 22 |
| 1981 | 30 |
| 1982 | 14 |
| 1983 | 16 |
| 1984 | 14 |
| 1985 | 14 |
| 1986 | 10 |
| 1987 | 10 |
| 1988 | 14 |
| 1989 | 18 |
| 1990 | 14 |
| 1991 | 16 |
| 1992 | 12 |
| 1993 | 10 |
| 1995 | 10 |
| 1997 | 10 |
| 2002 | 10 |
| 2003 | 14 |
| 2004 | 12 |
| 2005 | 10 |
| 2006 | 10 |
| 2008 | 10 |