| Year | Total | vs prev |
|---|---|---|
| 2006 | 0 | −100.0% |
| 2005 | 648 | −21.3% |
| 2004 | 823 | +82.9% |
| 2003 | 450 | — |
| 2001 | 0 | −100.0% |
| 2000 | 91 | −86.4% |
| 1999 | 671 | −34.3% |
| 1998 | 1,021 | −69.2% |
| 1997 | 3,310 | −33.7% |
| 1996 | 4,995 | −25.4% |
| 1995 | 6,693 | −17.7% |
| 1994 | 8,131 | −15.4% |
| 1993 | 9,615 | −3.6% |
| 1992 | 9,974 | +6.0% |
| 1991 | 9,405 | — |