| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.93 | 5.94 | 3.05 |
| 2024 | 3.12 | 4.25 | 2.28 |
| 2023 | 4.31 | 5.04 | 3.41 |
| 2022 | 3.94 | 5.89 | 3.04 |
| 2021 | 2.78 | 4.93 | 2.29 |
| 2020 | 2.98 | 4.5 | 2.16 |
| 2019 | 2.75 | 4.69 | 1.91 |
| 2018 | 7.53 | 10.41 | 3.44 |
| 2017 | 11.39 | 13.42 | 9.77 |
| 2016 | 11.65 | 19.48 | 9.38 |
| 2015 | 19.65 | 42.49 | 10.48 |
| 2014 | 11.4 | 15.14 | 8.64 |
| 2013 | 8.19 | 10.05 | 6.15 |
| 2012 | 7.83 | 11.95 | 5.23 |
| 2011 | 15.62 | 36.75 | 9.28 |
| 2010 | 30.07 | 40.4 | 20.57 |