| Year | Total | vs prev |
|---|---|---|
| 2021 | 0 | −100.0% |
| 2020 | 154 | −65.2% |
| 2019 | 442 | −23.4% |
| 2018 | 577 | −20.6% |
| 2017 | 727 | −46.5% |
| 2016 | 1,358 | +29.1% |
| 2015 | 1,052 | −17.4% |
| 2014 | 1,274 | −30.1% |
| 2013 | 1,823 | −19.6% |
| 2012 | 2,267 | +173.8% |
| 2011 | 828 | +41300.0% |
| 2010 | 2 | — |
| 2007 | 0 | −100.0% |
| 2006 | 600 | −46.9% |
| 2005 | 1,129 | +50.3% |
| 2004 | 751 | — |
| 2003 | 0 | −100.0% |
| 2002 | 163 | +32.5% |
| 2001 | 123 | — |