| Year | Rank | Number |
| 2002 | 16665 | 5 |
| 2001 | 14331 | 6 |
| 1997 | 8017 | 11 |
| 1996 | 8453 | 10 |
| 1995 | 6090 | 15 |
| 1994 | 8418 | 10 |
| 1993 | 7752 | 11 |
| 1992 | 7747 | 11 |
| 1991 | 8923 | 9 |
| 1990 | 10705 | 7 |
| 1989 | 5663 | 15 |
| 1988 | 7369 | 10 |
| 1987 | 12101 | 5 |
| 1986 | 10067 | 6 |
| 1985 | 8705 | 7 |
| 1984 | 9625 | 6 |
| 1983 | 10977 | 5 |
| 1981 | 9597 | 6 |
| 1979 | 9456 | 6 |
| 1978 | 7992 | 7 |
| 1975 | 8427 | 6 |