| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.63 | 9.66 | 5.41 |
| 2024 | 5.58 | 7.35 | 4.45 |
| 2023 | 8.12 | 11.47 | 6.26 |
| 2022 | 7.36 | 10.67 | 5.72 |
| 2021 | 8.71 | 10.77 | 6.61 |
| 2020 | 10.57 | 14.17 | 7.61 |
| 2019 | 6.54 | 11.1 | 3.93 |
| 2018 | 6.41 | 9.86 | 4.09 |
| 2017 | 9.69 | 13.23 | 7.09 |
| 2016 | 21.23 | 29.76 | 11.91 |
| 2015 | 20.83 | 34.27 | 10.46 |
| 2014 | 18.87 | 27.6 | 11.5 |
| 2013 | 19.47 | 30.76 | 13.37 |
| 2012 | 16.12 | 22.01 | 10.58 |
| 2011 | 21.55 | 30.52 | 16.77 |