| Year | Rank | Number |
| 2008 | 17663 | 5 |
| 2004 | 11693 | 8 |
| 2003 | 13970 | 6 |
| 2002 | 9523 | 10 |
| 2001 | 10153 | 9 |
| 2000 | 7594 | 13 |
| 1999 | 8251 | 11 |
| 1998 | 8630 | 10 |
| 1997 | 6863 | 13 |
| 1995 | 9615 | 8 |
| 1994 | 7632 | 11 |
| 1993 | 10656 | 7 |
| 1992 | 9528 | 8 |
| 1991 | 6982 | 12 |
| 1990 | 11471 | 6 |
| Year | Rank | Number |
| 2008 | 17663 | 5 |
| 2004 | 11693 | 8 |
| 2003 | 13970 | 6 |
| 2002 | 9523 | 10 |
| 2001 | 10153 | 9 |
| 2000 | 7594 | 13 |
| 1999 | 8251 | 11 |
| 1998 | 8630 | 10 |
| 1997 | 6863 | 13 |
| 1995 | 9615 | 8 |
| 1994 | 7632 | 11 |
| 1993 | 10656 | 7 |
| 1992 | 9528 | 8 |
| 1991 | 6982 | 12 |
| 1990 | 11471 | 6 |