| Year | Total | vs prev |
|---|---|---|
| 2007 | 0 | −100.0% |
| 2006 | 100 | −74.9% |
| 2005 | 399 | +5.0% |
| 2004 | 380 | −23.4% |
| 2003 | 496 | −30.6% |
| 2002 | 715 | +117.3% |
| 2001 | 329 | +22.8% |
| 2000 | 268 | −44.3% |
| 1999 | 481 | −35.6% |
| 1998 | 747 | −26.7% |
| 1997 | 1,019 | +197.1% |
| 1996 | 343 | +9.6% |
| 1995 | 313 | −30.0% |
| 1994 | 447 | −37.5% |
| 1993 | 715 | +23.3% |
| 1992 | 580 | — |