| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.31 | 2.56 | 2.07 |
| 2024 | 2.29 | 2.89 | 1.7 |
| 2023 | 2.65 | 3.83 | 2.1 |
| 2022 | 2.43 | 3.18 | 1.84 |
| 2021 | 5.21 | 8.3 | 3.05 |
| 2020 | 9.6 | 13.42 | 7.96 |
| 2019 | 9.51 | 12.34 | 6.96 |
| 2018 | 15.15 | 31.15 | 4.32 |
| 2017 | 21.49 | 34.17 | 10.94 |
| 2016 | 9.13 | 14.38 | 5.7 |
| 2015 | 8.55 | 19.25 | 4.8 |
| 2014 | 6.53 | 8.42 | 4.56 |
| 2013 | 4.05 | 5.5 | 3.2 |
| 2012 | 4.02 | 5.3 | 3.04 |
| 2011 | 6.04 | 7.85 | 4.6 |
| 2010 | 7.29 | 8.43 | 3.17 |