| Year | Rank | Number |
| 2011 | 15414 | 6 |
| 2009 | 10858 | 10 |
| 2008 | 12987 | 8 |
| 2007 | 11105 | 10 |
| 2004 | 12011 | 8 |
| 2003 | 14499 | 6 |
| 2002 | 14218 | 6 |
| 2001 | 16236 | 5 |
| 1999 | 13261 | 6 |
| 1998 | 11568 | 7 |
| 1997 | 12646 | 6 |
| 1995 | 9893 | 8 |
| 1993 | 9896 | 8 |
| 1992 | 14043 | 5 |
| 1991 | 12034 | 6 |
| 1990 | 10588 | 7 |
| 1987 | 10304 | 6 |
| 1986 | 8852 | 7 |
| 1985 | 11239 | 5 |
| 1984 | 10984 | 5 |
| 1983 | 10833 | 5 |
| 1982 | 9598 | 6 |
| 1981 | 9475 | 6 |
| 1976 | 7567 | 7 |