| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.84 | 5.64 | 4 |
| 2024 | 3.27 | 6.21 | 2.2 |
| 2023 | 3.33 | 3.81 | 2.92 |
| 2022 | 3.26 | 4.88 | 2.68 |
| 2021 | 3.54 | 4.48 | 2.96 |
| 2020 | 3.69 | 4.83 | 2.8 |
| 2019 | 4.47 | 8.24 | 3.19 |
| 2018 | 4.02 | 5.08 | 2.8 |
| 2017 | 8.66 | 12.09 | 4.19 |
| 2016 | 15.29 | 21.4 | 10.84 |
| 2015 | 18.5 | 30.07 | 12.1 |
| 2014 | 12.55 | 15.07 | 9.93 |
| 2013 | 6.19 | 10.58 | 3.7 |
| 2012 | 6.22 | 7.56 | 4.92 |