| Year | Rank | Number |
| 2011 | 12671 | 5 |
| 2009 | 12871 | 5 |
| 2008 | 12992 | 5 |
| 2007 | 10017 | 7 |
| 2006 | 10995 | 6 |
| 2005 | 9363 | 7 |
| 2004 | 10292 | 6 |
| 2002 | 8684 | 7 |
| 2001 | 9582 | 6 |
| 1997 | 3628 | 19 |
| 1995 | 5214 | 11 |
| 1994 | 8031 | 6 |
| 1993 | 6366 | 8 |
| 1992 | 4381 | 13 |
| 1991 | 3500 | 17 |
| 1990 | 5090 | 10 |
| 1989 | 4591 | 11 |
| 1988 | 3747 | 13 |
| 1987 | 5082 | 8 |
| 1986 | 6130 | 6 |
| 1984 | 6573 | 5 |
| 1978 | 6053 | 5 |