| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 10.4 | 11.65 | 8.92 |
| 2024 | 7.61 | 10.38 | 5.54 |
| 2023 | 7.64 | 10.9 | 5.15 |
| 2022 | 5.26 | 6.9 | 3.91 |
| 2021 | 6.03 | 8.2 | 4.72 |
| 2020 | 5.87 | 6.89 | 4.7 |
| 2019 | 5.55 | 7.61 | 4.71 |
| 2018 | 7.44 | 10.99 | 4.78 |
| 2017 | 9.86 | 13.88 | 8.17 |
| 2016 | 9.7 | 13.68 | 7.1 |
| 2015 | 7.54 | 12.99 | 4.92 |
| 2014 | 4.41 | 6.58 | 3.17 |
| 2013 | 3.29 | 4.42 | 2.65 |
| 2012 | 3.11 | 3.86 | 2.39 |
| 2011 | 4.82 | 6.52 | 3.03 |
| 2010 | 4.03 | 6.98 | 2.79 |
| 2009 | 3.14 | 3.95 | 2.55 |