| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.47 | 6.46 | 4.49 |
| 2024 | 4.44 | 6.28 | 3.03 |
| 2023 | 4.91 | 5.67 | 4.33 |
| 2022 | 3.94 | 5.79 | 2.95 |
| 2021 | 4.09 | 5.13 | 3.3 |
| 2020 | 5.82 | 7.07 | 4.82 |
| 2019 | 4.74 | 5.78 | 3.85 |
| 2018 | 4.49 | 5.66 | 3.51 |
| 2017 | 7.9 | 11.76 | 5.07 |
| 2016 | 10.74 | 14.71 | 8.28 |
| 2015 | 14.64 | 25.63 | 7.84 |
| 2014 | 15.26 | 17.94 | 12.82 |
| 2013 | 9.82 | 14.95 | 6.45 |
| 2012 | 9.04 | 12.07 | 5.22 |
| 2011 | 19.61 | 36.49 | 8.22 |
| 2010 | 30.8 | 37.42 | 24.78 |