| Year | Total | vs prev |
|---|---|---|
| 2018 | 0 | −100.0% |
| 2017 | 2 | −99.9% |
| 2016 | 1,525 | +22.7% |
| 2015 | 1,243 | −48.6% |
| 2014 | 2,419 | −44.1% |
| 2013 | 4,326 | −52.8% |
| 2012 | 9,162 | −3.6% |
| 2011 | 9,509 | +14.0% |
| 2010 | 8,341 | +63.3% |
| 2009 | 5,107 | −22.6% |
| 2008 | 6,594 | +3010.4% |
| 2007 | 212 | — |
| 1999 | 0 | −100.0% |
| 1998 | 2 | −99.8% |
| 1997 | 842 | −69.7% |
| 1996 | 2,775 | +50.6% |
| 1995 | 1,843 | — |