| Year | Total | vs prev |
|---|---|---|
| 2018 | 0 | −100.0% |
| 2017 | 141 | −97.6% |
| 2016 | 5,790 | −31.9% |
| 2015 | 8,505 | −19.1% |
| 2014 | 10,515 | −25.2% |
| 2013 | 14,065 | — |
| 2007 | 0 | −100.0% |
| 2006 | 1,494 | −91.5% |
| 2005 | 17,643 | −9.7% |
| 2004 | 19,531 | +2.9% |
| 2003 | 18,972 | +16.7% |
| 2002 | 16,258 | −21.4% |
| 2001 | 20,672 | −4.9% |
| 2000 | 21,740 | −3.8% |
| 1999 | 22,591 | +13.9% |
| 1998 | 19,842 | +40.6% |
| 1997 | 14,114 | +80.6% |
| 1996 | 7,814 | +25.8% |
| 1995 | 6,213 | −20.0% |
| 1994 | 7,771 | −23.8% |
| 1993 | 10,193 | −39.0% |
| 1992 | 16,697 | −15.8% |
| 1991 | 19,822 | — |