| Year | Total | vs prev |
|---|---|---|
| 2014 | 0 | −100.0% |
| 2013 | 14 | −95.5% |
| 2012 | 314 | −22.3% |
| 2011 | 404 | −27.2% |
| 2010 | 555 | −25.0% |
| 2009 | 740 | −20.3% |
| 2008 | 928 | +13.9% |
| 2007 | 815 | −21.2% |
| 2006 | 1,034 | −7.8% |
| 2005 | 1,122 | −6.8% |
| 2004 | 1,204 | +1.3% |
| 2003 | 1,188 | +207.8% |
| 2002 | 386 | −12.7% |
| 2001 | 442 | +0.5% |
| 2000 | 440 | −38.6% |
| 1999 | 717 | −30.4% |
| 1998 | 1,030 | −2.2% |
| 1997 | 1,053 | −18.1% |
| 1996 | 1,285 | — |