| Year | Total | vs prev |
|---|---|---|
| 2018 | 0 | −100.0% |
| 2017 | 388 | −97.0% |
| 2016 | 12,904 | −15.2% |
| 2015 | 15,222 | −18.0% |
| 2014 | 18,554 | −24.0% |
| 2013 | 24,421 | −16.3% |
| 2012 | 29,161 | −13.7% |
| 2011 | 33,784 | +19.2% |
| 2010 | 28,334 | +125.1% |
| 2009 | 12,590 | — |
| 2007 | 0 | −100.0% |
| 2006 | 515 | −79.9% |
| 2005 | 2,568 | −10.1% |
| 2004 | 2,855 | −15.3% |
| 2003 | 3,371 | +52.2% |
| 2002 | 2,215 | — |