| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2022 | 7.81 | 7.97 | 7.65 |
| 2021 | 8.73 | 13.06 | 6.37 |
| 2020 | 10.86 | 13.89 | 8.17 |
| 2019 | 11.55 | 14.81 | 9.66 |
| 2018 | 13.25 | 19.94 | 10.04 |
| 2017 | 13.81 | 19.86 | 10.31 |
| 2016 | 10.5 | 11.5 | 9.48 |
| 2015 | 14.73 | 21.13 | 8.73 |
| 2014 | 10.89 | 17.57 | 9.12 |
| 2013 | 13.98 | 19.86 | 10.32 |
| 2012 | 16.19 | 18.56 | 13.29 |
| 2011 | 18.25 | 24.24 | 12.99 |
| 2010 | 28.1 | 48.34 | 18.57 |
| 2009 | 115.13 | 477.43 | 45.1 |
| 2008 | 33.57 | 82.48 | 10.81 |