| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.49 | 3.09 | 1.89 |
| 2024 | 1.82 | 3.48 | 1.3 |
| 2023 | 2.41 | 2.96 | 2.01 |
| 2022 | 2.59 | 4.31 | 1.91 |
| 2021 | 3.27 | 4.94 | 2.15 |
| 2020 | 2.44 | 3.1 | 1.81 |
| 2019 | 3.09 | 6.32 | 1.76 |
| 2018 | 4.59 | 6.1 | 3.16 |
| 2017 | 6.68 | 8.62 | 5.58 |
| 2016 | 9.18 | 11.72 | 7.54 |
| 2015 | 16.02 | 26.48 | 6.96 |
| 2014 | 17.95 | 24.42 | 13.06 |
| 2013 | 7.53 | 15.63 | 4.52 |
| 2012 | 4.86 | 6.5 | 3.51 |
| 2011 | 8.28 | 11.08 | 5.45 |