| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.55 | 7.06 | 3.35 |
| 2024 | 5.42 | 9.04 | 3.18 |
| 2023 | 6.83 | 8.63 | 5.65 |
| 2022 | 5.78 | 9.12 | 3.91 |
| 2021 | 4.05 | 5.37 | 2.35 |
| 2020 | 4.21 | 6.26 | 2.86 |
| 2019 | 4.54 | 6.1 | 2.72 |
| 2018 | 3.79 | 5.88 | 2.46 |
| 2017 | 6.5 | 9.05 | 5.08 |
| 2016 | 8.33 | 10.7 | 6.84 |
| 2015 | 8.39 | 19.14 | 4.38 |
| 2014 | 4.77 | 6.55 | 3.06 |
| 2013 | 3.43 | 4.37 | 2.53 |
| 2012 | 4.61 | 6.87 | 2.88 |
| 2011 | 5.15 | 6.25 | 4.41 |
| 2010 | 5.32 | 7.06 | 3.76 |
| 2009 | 4.03 | 5.66 | 2.92 |