| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.14 | 6.88 | 5.04 |
| 2024 | 4.86 | 7.11 | 3.18 |
| 2023 | 3.34 | 3.88 | 3.07 |
| 2022 | 3.18 | 4.23 | 2.34 |
| 2021 | 3.71 | 4.44 | 3.16 |
| 2020 | 3.93 | 6.12 | 2.77 |
| 2019 | 8.45 | 12.81 | 5.78 |
| 2018 | 10.9 | 15.03 | 7.45 |
| 2017 | 14.15 | 17.59 | 12.29 |
| 2016 | 14.72 | 18.69 | 9.67 |
| 2015 | 15.92 | 24.53 | 10.15 |
| 2014 | 15.93 | 20.19 | 12.46 |
| 2013 | 15.68 | 17.99 | 11.45 |