| Year | Total | vs prev |
|---|---|---|
| 2004 | 0 | −100.0% |
| 2003 | 1 | −100.0% |
| 2002 | 2,536 | −30.5% |
| 2001 | 3,647 | −8.2% |
| 2000 | 3,973 | +27.3% |
| 1999 | 3,122 | −35.9% |
| 1998 | 4,869 | +26.0% |
| 1997 | 3,865 | +49.4% |
| 1996 | 2,587 | −17.1% |
| 1995 | 3,121 | −36.7% |
| 1994 | 4,930 | −31.4% |
| 1993 | 7,187 | −30.4% |
| 1992 | 10,323 | +65.6% |
| 1991 | 6,235 | — |