| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.08 | 8.2 | 4.74 |
| 2024 | 5.53 | 6.59 | 4.42 |
| 2023 | 7.31 | 9.12 | 6.15 |
| 2022 | 7.44 | 10.99 | 5.68 |
| 2021 | 11.87 | 16.55 | 9.68 |
| 2020 | 12.27 | 17.49 | 8.8 |
| 2019 | 10.58 | 12.4 | 8.77 |
| 2018 | 14.5 | 19.74 | 9.64 |
| 2017 | 14.14 | 19.14 | 11.96 |
| 2016 | 19.65 | 23.98 | 14.82 |
| 2015 | 15.84 | 30.38 | 9.54 |
| 2014 | 9.96 | 11.87 | 8.41 |
| 2013 | 9.98 | 12.8 | 7.09 |
| 2012 | 7.28 | 9.03 | 6.15 |
| 2011 | 11.33 | 16.03 | 8.56 |
| 2010 | 17.4 | 21.44 | 14.93 |