| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.15 | 4.52 | 3.54 |
| 2024 | 2.83 | 6.42 | 1.94 |
| 2023 | 3.33 | 3.92 | 2.74 |
| 2022 | 3.3 | 4.34 | 2.6 |
| 2021 | 3.57 | 4.82 | 2.47 |
| 2020 | 4.31 | 8.42 | 2.9 |
| 2019 | 3.99 | 5.08 | 3.01 |
| 2018 | 4.55 | 6.23 | 3.85 |
| 2017 | 5.11 | 6.47 | 4.27 |
| 2016 | 7.74 | 13.02 | 5.13 |
| 2015 | 11.92 | 21.81 | 7.34 |
| 2014 | 8.54 | 10.38 | 6.81 |
| 2013 | 6.64 | 7.65 | 5.51 |
| 2012 | 8.93 | 14.32 | 5.55 |
| 2011 | 21.85 | 33.95 | 10.34 |