| Year | Rank | Number |
| 2010 | 10004 | 7 |
| 2008 | 11514 | 6 |
| 2007 | 12997 | 5 |
| 2006 | 8984 | 8 |
| 2005 | 6790 | 11 |
| 2004 | 11969 | 5 |
| 2001 | 11168 | 5 |
| 2000 | 7702 | 8 |
| 1997 | 8540 | 6 |
| 1995 | 9354 | 5 |
| 1994 | 6590 | 8 |
| 1993 | 9232 | 5 |
| 1992 | 8901 | 5 |
| 1989 | 5833 | 8 |
| 1984 | 5840 | 6 |
| 1981 | 5126 | 7 |
| 1978 | 4293 | 8 |
| 1977 | 3949 | 9 |
| 1976 | 3827 | 9 |