| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.14 | 5.15 | 3.39 |
| 2024 | 3.28 | 5.12 | 2.28 |
| 2023 | 4.02 | 5.38 | 3.33 |
| 2022 | 3.93 | 4.96 | 2.97 |
| 2021 | 6.02 | 9.88 | 4.61 |
| 2020 | 7.42 | 10.78 | 4.97 |
| 2019 | 8.89 | 11.25 | 4.26 |
| 2018 | 5.21 | 6.87 | 3.63 |
| 2017 | 9.04 | 13.58 | 6.04 |
| 2016 | 10.82 | 13.84 | 7.96 |
| 2015 | 9.71 | 14.4 | 5.45 |
| 2014 | 8.58 | 10.37 | 7.41 |
| 2013 | 8.99 | 11.68 | 7.14 |
| 2012 | 12.98 | 15.94 | 8.51 |
| 2011 | 16.54 | 24.15 | 10.79 |
| 2010 | 15.04 | 23.97 | 10.32 |
| 2009 | 9.36 | 13.67 | 4.68 |
| 2008 | 5.72 | 12.1 | 2.61 |