| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 8.84 | 10.63 | 6.22 |
| 2023 | 11.88 | 15.34 | 10.15 |
| 2022 | 9.53 | 12.81 | 5.99 |
| 2021 | 9.34 | 11.84 | 7.85 |
| 2020 | 12.61 | 22.97 | 6.87 |
| 2019 | 8.46 | 10.39 | 6.97 |
| 2018 | 7.95 | 10.67 | 6.41 |
| 2017 | 13.28 | 17.94 | 9.18 |
| 2016 | 18.53 | 24.66 | 15.75 |
| 2015 | 19.15 | 34.82 | 12.26 |
| 2014 | 13.45 | 20.43 | 8.4 |
| 2013 | 9.31 | 12.65 | 7.55 |
| 2012 | 10.83 | 14.37 | 7.47 |
| 2011 | 16.92 | 20.82 | 12.98 |