| Year | Rank | Number |
| 2010 | 12296 | 5 |
| 2009 | 12468 | 5 |
| 2007 | 9809 | 7 |
| 2004 | 6988 | 10 |
| 2003 | 7871 | 8 |
| 2002 | 7057 | 9 |
| 2001 | 4896 | 15 |
| 2000 | 5586 | 12 |
| 1999 | 8740 | 6 |
| 1998 | 4879 | 13 |
| 1997 | 6105 | 9 |
| 1996 | 6519 | 8 |
| 1995 | 5942 | 9 |
| 1994 | 7800 | 6 |
| 1993 | 4701 | 12 |
| 1992 | 6144 | 8 |
| 1991 | 7300 | 6 |
| 1990 | 4674 | 11 |
| 1989 | 6968 | 6 |
| 1988 | 4161 | 11 |
| 1987 | 3962 | 11 |
| 1986 | 3648 | 12 |
| 1985 | 5157 | 7 |
| 1984 | 4983 | 7 |
| 1983 | 4924 | 7 |
| 1982 | 5638 | 6 |
| 1980 | 5542 | 6 |
| 1978 | 5803 | 5 |