| Year | Total | vs prev |
|---|---|---|
| 2016 | 6,816 | −27.3% |
| 2015 | 9,373 | +60.4% |
| 2014 | 5,845 | −2.0% |
| 2013 | 5,963 | −10.7% |
| 2012 | 6,676 | +3.9% |
| 2011 | 6,428 | −4.0% |
| 2010 | 6,693 | +8.6% |
| 2009 | 6,163 | −7.4% |
| 2008 | 6,652 | +57.2% |
| 2007 | 4,232 | +33.6% |
| 2006 | 3,167 | −19.6% |
| 2005 | 3,937 | −6.1% |
| 2004 | 4,191 | −11.0% |
| 2003 | 4,708 | −5.8% |
| 2002 | 4,997 | +51.2% |
| 2001 | 3,305 | +174.7% |
| 2000 | 1,203 | −1.3% |
| 1999 | 1,219 | −35.3% |
| 1998 | 1,884 | −5.7% |
| 1997 | 1,997 | — |