| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.54 | 10 | 7.14 |
| 2024 | 6.27 | 10.44 | 4.64 |
| 2023 | 6.31 | 9.92 | 3.62 |
| 2022 | 3.11 | 3.95 | 2.42 |
| 2021 | 4.43 | 6.32 | 3.26 |
| 2020 | 5.22 | 8.16 | 3.88 |
| 2019 | 4.08 | 5.1 | 2.91 |
| 2018 | 3.43 | 4.9 | 2.44 |
| 2017 | 8.1 | 12.94 | 4.23 |
| 2016 | 15 | 21.69 | 11.9 |
| 2015 | 20.64 | 38.3 | 11.97 |
| 2014 | 10.91 | 15.6 | 8.38 |
| 2013 | 9.23 | 13.5 | 7.05 |
| 2012 | 9.23 | 12.39 | 6.61 |
| 2011 | 18.09 | 31.12 | 11.72 |
| 2010 | 33.15 | 46.09 | 27.16 |