| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.29 | 3.19 | 1.79 |
| 2024 | 3.06 | 4.31 | 2.15 |
| 2023 | 3.71 | 5.85 | 2.2 |
| 2022 | 2.23 | 3.4 | 1.07 |
| 2021 | 1.94 | 2.61 | 1.52 |
| 2020 | 2.58 | 4.25 | 1.15 |
| 2019 | 1.61 | 2.31 | 1.2 |
| 2018 | 2.54 | 4.22 | 1.45 |
| 2017 | 5.79 | 7.19 | 4.08 |
| 2016 | 7.53 | 14 | 4.35 |
| 2015 | 8.81 | 15.85 | 4.46 |
| 2014 | 5.38 | 8.06 | 4.16 |
| 2013 | 2.88 | 5.11 | 1.77 |
| 2012 | 1.86 | 2.26 | 1.48 |
| 2011 | 2.8 | 3.57 | 2.18 |