| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.23 | 5.98 | 4.71 |
| 2024 | 5.39 | 6.43 | 4.4 |
| 2023 | 6.69 | 7.65 | 6.14 |
| 2022 | 7.4 | 10.07 | 5.91 |
| 2021 | 9.09 | 11.36 | 7.72 |
| 2020 | 9.48 | 17.43 | 7.05 |
| 2019 | 9.03 | 10.8 | 7.96 |
| 2018 | 10.96 | 14.76 | 7.97 |
| 2017 | 17.75 | 23.75 | 13.35 |
| 2016 | 14.98 | 25.14 | 10.68 |
| 2015 | 13.54 | 21.7 | 9.34 |
| 2014 | 9.56 | 10.97 | 8.19 |
| 2013 | 7.73 | 9.19 | 6.56 |
| 2012 | 8.22 | 11.1 | 5.86 |
| 2011 | 15.42 | 21.05 | 9.49 |
| 2010 | 20.96 | 25.06 | 17.33 |