| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.67 | 7.04 | 4.07 |
| 2024 | 3.44 | 6.41 | 1.99 |
| 2023 | 4.1 | 5.11 | 3.44 |
| 2022 | 3.84 | 4.78 | 3.16 |
| 2021 | 3.22 | 4.15 | 2.66 |
| 2020 | 2.53 | 3.69 | 1.94 |
| 2019 | 1.59 | 2.28 | 0.83 |
| 2018 | 1.5 | 2.78 | 0.67 |
| 2017 | 2.5 | 2.82 | 2.29 |
| 2016 | 5.49 | 8.76 | 2.6 |
| 2015 | 10.77 | 17.49 | 6.68 |
| 2014 | 6.46 | 8.34 | 4.36 |
| 2013 | 5.29 | 6.53 | 3.42 |
| 2012 | 3.07 | 3.82 | 2.09 |
| 2011 | 4.01 | 4.96 | 2.34 |
| 2010 | 8.39 | 24.25 | 3.05 |
| 2009 | 22.34 | 25.25 | 12.96 |