| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.73 | 7.13 | 6.21 |
| 2024 | 6.07 | 8.75 | 4.6 |
| 2023 | 4.98 | 5.74 | 4.12 |
| 2022 | 5.25 | 6.73 | 4.46 |
| 2021 | 7.53 | 9.06 | 6.32 |
| 2020 | 5.67 | 9.3 | 3.12 |
| 2019 | 24.94 | 39.03 | 4.58 |
| 2018 | 18.95 | 25.3 | 13.45 |
| 2017 | 18.1 | 22.88 | 14.46 |
| 2016 | 15.68 | 22.7 | 9.36 |
| 2015 | 20.99 | 36.29 | 8.33 |
| 2014 | 15.79 | 29.8 | 12.86 |
| 2013 | 16.62 | 20.2 | 13.44 |
| 2012 | 16.28 | 20.11 | 10.88 |
| 2011 | 15.31 | 19.81 | 11.19 |