| Year | Rank | Number |
| 2011 | 10401 | 7 |
| 2009 | 11964 | 6 |
| 2008 | 8791 | 9 |
| 2007 | 10567 | 7 |
| 2006 | 6770 | 12 |
| 2005 | 11075 | 6 |
| 2003 | 7090 | 10 |
| 2002 | 8222 | 8 |
| 2001 | 5319 | 14 |
| 2000 | 8860 | 7 |
| 1999 | 6937 | 9 |
| 1998 | 6168 | 10 |
| 1997 | 5963 | 10 |
| 1996 | 6355 | 9 |
| 1995 | 5790 | 10 |
| 1994 | 5763 | 10 |
| 1993 | 8385 | 6 |
| 1992 | 5536 | 10 |
| 1991 | 5396 | 10 |
| 1990 | 4900 | 11 |
| 1989 | 4725 | 11 |
| 1988 | 5089 | 9 |
| 1987 | 5906 | 7 |
| 1986 | 3804 | 12 |
| 1985 | 6293 | 6 |
| 1984 | 5404 | 7 |