| Year | Rank | Number |
| 2002 | 15678 | 5 |
| 2001 | 15586 | 5 |
| 2000 | 11912 | 7 |
| 1999 | 10430 | 8 |
| 1998 | 10215 | 8 |
| 1997 | 8391 | 10 |
| 1996 | 5788 | 16 |
| 1995 | 4354 | 23 |
| 1994 | 5730 | 16 |
| 1993 | 5685 | 16 |
| 1992 | 4854 | 20 |
| 1991 | 7001 | 12 |
| 1990 | 6493 | 13 |
| 1989 | 4867 | 18 |
| 1988 | 5912 | 13 |
| 1987 | 5940 | 12 |
| 1986 | 6633 | 10 |
| 1985 | 6982 | 9 |
| 1984 | 4487 | 16 |
| 1983 | 10372 | 5 |
| 1981 | 5587 | 12 |
| 1980 | 4985 | 14 |
| 1979 | 7358 | 8 |
| 1977 | 6920 | 8 |
| 1976 | 8220 | 6 |
| 1974 | 7748 | 6 |
| 1971 | 6652 | 7 |