| Year | Total | vs prev |
|---|---|---|
| 2015 | 0 | −100.0% |
| 2014 | 67 | −27.2% |
| 2013 | 92 | −61.8% |
| 2012 | 241 | +39.3% |
| 2011 | 173 | −30.8% |
| 2010 | 250 | −28.8% |
| 2009 | 351 | +3.5% |
| 2008 | 339 | — |
| 2006 | 0 | −100.0% |
| 2005 | 3 | −98.7% |
| 2004 | 229 | +55.8% |
| 2003 | 147 | −35.2% |
| 2002 | 227 | −58.0% |
| 2001 | 540 | −29.4% |
| 2000 | 765 | +2.0% |
| 1999 | 750 | −24.2% |
| 1998 | 989 | — |