| Year | Total | vs prev |
|---|---|---|
| 2022 | 0 | −100.0% |
| 2021 | 3 | −98.0% |
| 2020 | 148 | −36.5% |
| 2019 | 233 | −21.8% |
| 2018 | 298 | −41.3% |
| 2017 | 508 | −17.3% |
| 2016 | 614 | −26.2% |
| 2015 | 832 | +38.7% |
| 2014 | 600 | +391.8% |
| 2013 | 122 | −60.0% |
| 2012 | 305 | −27.7% |
| 2011 | 422 | −29.0% |
| 2010 | 594 | −2.3% |
| 2009 | 608 | +221.7% |
| 2008 | 189 | — |