| Year | Rank | Number |
| 2011 | 10350 | 7 |
| 2008 | 9564 | 8 |
| 2007 | 9472 | 8 |
| 2006 | 11584 | 6 |
| 2004 | 7969 | 9 |
| 2003 | 10469 | 6 |
| 2002 | 9091 | 7 |
| 2001 | 11754 | 5 |
| 1999 | 9514 | 6 |
| 1998 | 5711 | 11 |
| 1996 | 7701 | 7 |
| 1995 | 8540 | 6 |
| 1994 | 8465 | 6 |
| 1993 | 9703 | 5 |
| 1991 | 7932 | 6 |
| 1990 | 6922 | 7 |
| 1989 | 5459 | 9 |
| 1987 | 6693 | 6 |
| 1982 | 7023 | 5 |
| 1981 | 6000 | 6 |