| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.92 | 5.01 | 3.55 |
| 2024 | 3.52 | 4.58 | 2.34 |
| 2023 | 3.58 | 4.46 | 2.61 |
| 2022 | 3.78 | 4.63 | 2.93 |
| 2021 | 4.84 | 7.17 | 2.63 |
| 2020 | 2.69 | 3.73 | 1.91 |
| 2019 | 2.88 | 4.12 | 2.2 |
| 2018 | 3.32 | 4.99 | 2.17 |
| 2017 | 4.88 | 7 | 4 |
| 2016 | 4.97 | 6.21 | 3.4 |
| 2015 | 6.59 | 10.57 | 3.32 |
| 2014 | 5.66 | 8.44 | 4.7 |
| 2013 | 6.41 | 8.26 | 5.23 |
| 2012 | 8.3 | 10.95 | 5.77 |
| 2011 | 9.34 | 12.82 | 6.48 |