| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.49 | 3.66 | 2.08 |
| 2024 | 2.06 | 2.91 | 1.65 |
| 2023 | 3.29 | 5.34 | 2.03 |
| 2022 | 5.62 | 9.3 | 3.95 |
| 2021 | 14.99 | 24.81 | 7.73 |
| 2020 | 8.61 | 22.08 | 3.26 |
| 2019 | 3.55 | 4.98 | 1.57 |
| 2018 | 3.19 | 5.21 | 1.78 |
| 2017 | 5.8 | 7.22 | 4.38 |
| 2016 | 6.71 | 10.57 | 3.78 |
| 2015 | 4.83 | 7.42 | 2.6 |
| 2014 | 11.4 | 20.31 | 5.01 |
| 2013 | 7.67 | 12.74 | 4.24 |
| 2012 | 5.18 | 7.38 | 3.64 |
| 2011 | 11.67 | 17.4 | 6.41 |
| 2010 | 18.97 | 28.2 | 16.04 |