| Year | Total | vs prev |
|---|---|---|
| 2014 | 0 | −100.0% |
| 2013 | 11 | −91.5% |
| 2012 | 129 | −23.2% |
| 2011 | 168 | −44.0% |
| 2010 | 300 | −3.8% |
| 2009 | 312 | −32.5% |
| 2008 | 462 | −32.7% |
| 2007 | 686 | −10.6% |
| 2006 | 767 | +121.0% |
| 2005 | 347 | −31.4% |
| 2004 | 506 | +69.8% |
| 2003 | 298 | −57.2% |
| 2002 | 696 | +11.7% |
| 2001 | 623 | −31.4% |
| 2000 | 908 | −27.6% |
| 1999 | 1,255 | +45.8% |
| 1998 | 861 | — |