| Year | Total | vs prev |
|---|---|---|
| 2013 | 0 | −100.0% |
| 2012 | 1 | −83.3% |
| 2011 | 6 | −77.8% |
| 2010 | 27 | −47.1% |
| 2009 | 51 | −53.6% |
| 2008 | 110 | −63.0% |
| 2007 | 297 | −45.1% |
| 2006 | 541 | +17933.3% |
| 2005 | 3 | +200.0% |
| 2004 | 1 | −98.7% |
| 2003 | 75 | −82.3% |
| 2002 | 423 | −75.6% |
| 2001 | 1,732 | −12.1% |
| 2000 | 1,970 | +228.9% |
| 1999 | 599 | — |