| Year | Total | vs prev |
|---|---|---|
| 2005 | 0 | −100.0% |
| 2004 | 1 | −99.7% |
| 2003 | 369 | −97.2% |
| 2002 | 13,183 | −14.3% |
| 2001 | 15,374 | +36.4% |
| 2000 | 11,271 | +21.0% |
| 1999 | 9,316 | −4.7% |
| 1998 | 9,776 | +13.9% |
| 1997 | 8,585 | +20.0% |
| 1996 | 7,156 | −30.0% |
| 1995 | 10,216 | −34.1% |
| 1994 | 15,498 | −5.4% |
| 1993 | 16,375 | −21.1% |
| 1992 | 20,761 | −25.5% |
| 1991 | 27,885 | — |
