| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.33 | 4.64 | 3.75 |
| 2024 | 3.38 | 5.05 | 2.59 |
| 2023 | 3.85 | 4.19 | 3.33 |
| 2022 | 3.83 | 5.07 | 3.23 |
| 2021 | 4.4 | 5.01 | 3.9 |
| 2020 | 5.7 | 7.12 | 4.77 |
| 2019 | 4.66 | 6.63 | 3.92 |
| 2018 | 5.81 | 8.74 | 3.43 |
| 2017 | 10.93 | 14.54 | 7.42 |
| 2016 | 12.23 | 15.08 | 8.23 |
| 2015 | 14.54 | 28.65 | 8.06 |
| 2014 | 10.42 | 13.58 | 7.79 |
| 2013 | 8.32 | 10.55 | 6.29 |
| 2012 | 7.11 | 8.51 | 5.6 |