| Year | Rank | Number |
| 2003 | 16047 | 5 |
| 1995 | 10626 | 7 |
| 1994 | 11917 | 6 |
| 1992 | 9567 | 8 |
| 1990 | 7341 | 11 |
| 1989 | 6992 | 11 |
| 1988 | 4865 | 17 |
| 1987 | 6818 | 10 |
| 1986 | 7798 | 8 |
| 1985 | 6987 | 9 |
| 1984 | 4489 | 16 |
| 1983 | 5842 | 11 |
| 1982 | 4035 | 19 |
| 1981 | 5271 | 13 |
| 1980 | 6817 | 9 |
| 1979 | 6725 | 9 |
| 1977 | 7604 | 7 |
| 1976 | 9372 | 5 |
| 1975 | 9172 | 5 |
| 1974 | 6294 | 8 |
| 1973 | 8513 | 5 |
| 1972 | 6598 | 7 |
| 1971 | 5573 | 9 |