| Year | Rank | Number |
| 1995 | 12846 | 6 |
| 1994 | 8582 | 10 |
| 1992 | 12828 | 6 |
| 1991 | 8395 | 10 |
| 1990 | 14480 | 5 |
| 1989 | 6034 | 14 |
| 1988 | 11291 | 6 |
| 1987 | 5513 | 14 |
| 1986 | 4474 | 18 |
| 1985 | 6306 | 11 |
| 1984 | 5421 | 13 |
| 1983 | 4616 | 16 |
| 1982 | 6208 | 11 |
| 1981 | 7168 | 9 |
| 1980 | 5137 | 14 |
| 1979 | 6526 | 10 |
| 1978 | 5102 | 13 |
| 1977 | 3566 | 21 |
| 1976 | 4081 | 16 |
| 1975 | 4071 | 16 |
| 1974 | 5625 | 10 |
| 1973 | 9310 | 5 |
| 1972 | 9148 | 5 |