| Year | Total | vs prev |
|---|---|---|
| 2005 | 0 | −100.0% |
| 2004 | 146 | −85.8% |
| 2003 | 1,027 | −11.4% |
| 2002 | 1,159 | +19.4% |
| 2001 | 971 | −21.7% |
| 2000 | 1,240 | −7.4% |
| 1999 | 1,339 | −7.0% |
| 1998 | 1,440 | +24.5% |
| 1997 | 1,157 | +13.0% |
| 1996 | 1,024 | −27.2% |
| 1995 | 1,407 | −34.2% |
| 1994 | 2,137 | +11.6% |
| 1993 | 1,915 | +55.3% |
| 1992 | 1,233 | — |