| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.89 | 6.22 | 3.7 |
| 2024 | 2.21 | 3.68 | 1.55 |
| 2023 | 2.63 | 2.99 | 2.18 |
| 2022 | 2.51 | 3.37 | 1.94 |
| 2021 | 3.32 | 4.01 | 2.79 |
| 2020 | 6.27 | 8.61 | 3.41 |
| 2019 | 6.36 | 7.7 | 5.16 |
| 2018 | 6.68 | 7.84 | 4.84 |
| 2017 | 9.83 | 13.28 | 6.75 |
| 2016 | 15.1 | 17.7 | 12.1 |
| 2015 | 18.5 | 33.85 | 8.34 |
| 2014 | 9.69 | 12.36 | 6.93 |
| 2013 | 7.73 | 9.66 | 5.92 |
| 2012 | 5.49 | 6.53 | 4.77 |
| 2011 | 6.47 | 8.03 | 4.74 |