| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.17 | 3.94 | 2.6 |
| 2024 | 2.77 | 3.94 | 1.7 |
| 2023 | 5.18 | 7.7 | 3.38 |
| 2022 | 3.53 | 5.06 | 2.43 |
| 2021 | 4.06 | 5.27 | 3.12 |
| 2020 | 5.51 | 7.71 | 4.38 |
| 2019 | 4.64 | 6.16 | 3.55 |
| 2018 | 4.47 | 5.71 | 3.48 |
| 2017 | 5.1 | 6.4 | 4.28 |
| 2016 | 6.89 | 12.29 | 5.78 |
| 2015 | 11.8 | 13.66 | 6.03 |
| 2014 | 6.22 | 8.72 | 3.97 |
| 2013 | 5.38 | 9.64 | 3.17 |
| 2012 | 3.51 | 4.22 | 2.87 |
| 2011 | 4.29 | 5.25 | 3.34 |