| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.48 | 5.17 | 2.57 |
| 2024 | 2.58 | 3.96 | 1.65 |
| 2023 | 3.3 | 4.07 | 2.68 |
| 2022 | 3.03 | 4.37 | 2.31 |
| 2021 | 3.64 | 5.25 | 2.54 |
| 2020 | 5.61 | 8.31 | 3.66 |
| 2019 | 3.32 | 4.14 | 2.52 |
| 2018 | 3.87 | 5.41 | 2.51 |
| 2017 | 6.76 | 8.33 | 4.83 |
| 2016 | 8.58 | 10.62 | 7.03 |
| 2015 | 12.65 | 22.69 | 7.79 |
| 2014 | 8.84 | 12.05 | 7.03 |
| 2013 | 5.6 | 7.47 | 4.04 |
| 2012 | 5.4 | 7.47 | 3.6 |
| 2011 | 10.74 | 17.77 | 6.73 |
| 2010 | 14.97 | 18.42 | 12.76 |