| Year | Total | vs prev |
|---|---|---|
| 2005 | 0 | −100.0% |
| 2004 | 1,232 | −94.1% |
| 2003 | 20,993 | +31.7% |
| 2002 | 15,941 | +47.4% |
| 2001 | 10,812 | −1.8% |
| 2000 | 11,015 | +7.7% |
| 1999 | 10,230 | +5.7% |
| 1998 | 9,674 | −9.4% |
| 1997 | 10,677 | +29.5% |
| 1996 | 8,242 | −1.3% |
| 1995 | 8,351 | +22.4% |
| 1994 | 6,820 | +59.6% |
| 1993 | 4,272 | −35.4% |
| 1992 | 6,612 | +16.0% |
| 1991 | 5,701 | — |