| Year | Total | vs prev |
|---|---|---|
| 2023 | 0 | −100.0% |
| 2022 | 1 | −97.1% |
| 2021 | 34 | +100.0% |
| 2020 | 17 | +41.7% |
| 2019 | 12 | −71.4% |
| 2018 | 42 | −32.3% |
| 2017 | 62 | −34.0% |
| 2016 | 94 | +123.8% |
| 2015 | 42 | +44.8% |
| 2014 | 29 | −31.0% |
| 2013 | 42 | +2.4% |
| 2012 | 41 | −24.1% |
| 2011 | 54 | +31.7% |
| 2010 | 41 | −19.6% |
| 2009 | 51 | −50.5% |
| 2008 | 103 | +368.2% |
| 2007 | 22 | — |