| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.11 | 6.12 | 4.2 |
| 2024 | 3.76 | 6.41 | 2.81 |
| 2023 | 4.52 | 7.01 | 2.64 |
| 2022 | 2.78 | 4.09 | 2 |
| 2021 | 3.15 | 3.85 | 2.58 |
| 2020 | 4.12 | 5.71 | 2.85 |
| 2019 | 3.29 | 4.91 | 2.21 |
| 2018 | 3.69 | 5.45 | 2.07 |
| 2017 | 6.49 | 9.43 | 4.91 |
| 2016 | 14.85 | 22.62 | 9.22 |
| 2015 | 15.34 | 26.16 | 8.52 |
| 2014 | 12.33 | 16.78 | 8.28 |
| 2013 | 9.99 | 14.41 | 5.98 |
| 2012 | 8.14 | 10.83 | 5.51 |
| 2011 | 9.1 | 14.14 | 6.58 |
| 2010 | 13.52 | 15.25 | 11.15 |