| Year | Rank | Number |
| 2011 | 1650 | 91 |
| 2010 | 1804 | 81 |
| 2009 | 1932 | 73 |
| 2008 | 1674 | 91 |
| 2007 | 1517 | 104 |
| 2006 | 1507 | 100 |
| 2005 | 1708 | 78 |
| 2004 | 1691 | 76 |
| 2003 | 2060 | 55 |
| 2002 | 1954 | 57 |
| 2001 | 1827 | 61 |
| 2000 | 1903 | 55 |
| 1999 | 2111 | 45 |
| 1998 | 2361 | 37 |
| 1997 | 2691 | 29 |
| 1996 | 3148 | 23 |
| 1995 | 4125 | 15 |
| 1994 | 4381 | 14 |
| 1993 | 5134 | 11 |
| 1992 | 4190 | 14 |
| 1991 | 4578 | 12 |
| 1990 | 4789 | 11 |
| 1989 | 4117 | 13 |
| 1988 | 4936 | 9 |
| 1987 | 4059 | 11 |
| 1986 | 6214 | 6 |
| 1984 | 6681 | 5 |
| 1982 | 4352 | 9 |
| 1980 | 5133 | 7 |