| Year | Total | vs prev |
|---|---|---|
| 2004 | 0 | −100.0% |
| 2003 | 13 | −99.3% |
| 2002 | 1,770 | −43.0% |
| 2001 | 3,107 | −19.2% |
| 2000 | 3,844 | −10.7% |
| 1999 | 4,306 | −3.7% |
| 1998 | 4,470 | −49.0% |
| 1997 | 8,758 | +14.7% |
| 1996 | 7,636 | −3.1% |
| 1995 | 7,883 | −1.0% |
| 1994 | 7,960 | +46.2% |
| 1993 | 5,444 | −12.4% |
| 1992 | 6,218 | +37.2% |
| 1991 | 4,531 | — |