| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.26 | 3.62 | 2.89 |
| 2024 | 2.38 | 4.04 | 1.68 |
| 2023 | 2.67 | 4.76 | 1.54 |
| 2022 | 1.82 | 3.51 | 1.3 |
| 2021 | 3.14 | 5.12 | 1.84 |
| 2020 | 7.06 | 10.76 | 3.98 |
| 2019 | 4.1 | 5.84 | 3.09 |
| 2018 | 5.44 | 8.56 | 3.31 |
| 2017 | 8.28 | 9.88 | 6.82 |
| 2016 | 8.83 | 11.63 | 6.37 |
| 2015 | 12.45 | 14.15 | 8.81 |
| 2014 | 8.42 | 10.92 | 5.02 |
| 2013 | 4.36 | 6.08 | 2.9 |
| 2012 | 2.55 | 2.91 | 2.27 |