| Year | Total | vs prev |
|---|---|---|
| 2019 | 0 | −100.0% |
| 2018 | 3 | −99.8% |
| 2017 | 1,764 | −74.5% |
| 2016 | 6,928 | −22.2% |
| 2015 | 8,902 | −9.4% |
| 2014 | 9,828 | −31.1% |
| 2013 | 14,261 | −2.6% |
| 2012 | 14,646 | +5.6% |
| 2011 | 13,866 | +20.0% |
| 2010 | 11,558 | +6.2% |
| 2009 | 10,884 | −15.5% |
| 2008 | 12,882 | −25.5% |
| 2007 | 17,290 | −5.8% |
| 2006 | 18,364 | −21.7% |
| 2005 | 23,454 | +72.7% |
| 2004 | 13,583 | — |
