| Year | Total | vs prev |
|---|---|---|
| 2021 | 0 | −100.0% |
| 2020 | 7,559 | −56.7% |
| 2019 | 17,472 | −4.5% |
| 2018 | 18,301 | −15.2% |
| 2017 | 21,579 | +17.4% |
| 2016 | 18,386 | −0.7% |
| 2015 | 18,520 | +2.6% |
| 2014 | 18,048 | +4.9% |
| 2013 | 17,203 | +33.3% |
| 2012 | 12,902 | +9.1% |
| 2011 | 11,824 | −10.7% |
| 2010 | 13,236 | −11.7% |
| 2009 | 14,987 | +169.3% |
| 2008 | 5,566 | — |