| Year | Total | vs prev |
|---|---|---|
| 2008 | 0 | −100.0% |
| 2007 | 5 | −98.1% |
| 2006 | 266 | −23.8% |
| 2005 | 349 | −30.6% |
| 2004 | 503 | −13.3% |
| 2003 | 580 | −2.4% |
| 2002 | 594 | −25.0% |
| 2001 | 792 | −27.3% |
| 2000 | 1,089 | +96.2% |
| 1999 | 555 | +74.0% |
| 1998 | 319 | −14.7% |
| 1997 | 374 | −0.8% |
| 1996 | 377 | +25.2% |
| 1995 | 301 | −52.6% |
| 1994 | 635 | +205.3% |
| 1993 | 208 | — |