| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.58 | 11.4 | 4.34 |
| 2024 | 3.81 | 5.84 | 2.82 |
| 2023 | 5.42 | 7.68 | 4.08 |
| 2022 | 8.33 | 20.78 | 4.99 |
| 2021 | 4.52 | 8.47 | 2.25 |
| 2020 | 3.82 | 5.35 | 2.74 |
| 2019 | 3.26 | 4.44 | 2.46 |
| 2018 | 3.32 | 4.97 | 2.2 |
| 2017 | 5.11 | 5.91 | 4.05 |
| 2016 | 6.34 | 8.6 | 5.53 |
| 2015 | 9.11 | 18.19 | 5.51 |
| 2014 | 6.76 | 8.47 | 5.26 |
| 2013 | 5.74 | 7.31 | 4.21 |
| 2012 | 5.09 | 6.41 | 4.05 |
| 2011 | 8.59 | 14.36 | 5.09 |
| 2010 | 15.39 | 18.28 | 12.13 |
| 2009 | 7.75 | 15.62 | 3.69 |
| 2008 | 5.34 | 9.55 | 2.31 |