| Year | Total | vs prev |
|---|---|---|
| 2020 | 0 | −100.0% |
| 2019 | 45 | −52.6% |
| 2018 | 95 | −91.0% |
| 2017 | 1,056 | −45.1% |
| 2016 | 1,923 | −24.3% |
| 2015 | 2,541 | +26.7% |
| 2014 | 2,006 | −19.0% |
| 2013 | 2,476 | −6.1% |
| 2012 | 2,637 | +58.2% |
| 2011 | 1,667 | −30.3% |
| 2010 | 2,391 | +21.9% |
| 2009 | 1,962 | −33.2% |
| 2008 | 2,936 | −27.9% |
| 2007 | 4,071 | +30.9% |
| 2006 | 3,111 | +34466.7% |
| 2005 | 9 | — |