| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 3.06 | 3.26 | 2.7 |
| 2025 | 2.96 | 3.56 | 2.29 |
| 2024 | 2.52 | 3.28 | 2.01 |
| 2023 | 4 | 6.59 | 2.69 |
| 2022 | 4.74 | 8.22 | 1.02 |
| 2021 | 2.33 | 4.19 | 1.01 |
| 2020 | 4.04 | 5.88 | 3.22 |
| 2019 | 3.59 | 6.86 | 2.46 |
| 2018 | 5.23 | 12.56 | 2.67 |
| 2017 | 8.23 | 11.27 | 5.58 |
| 2016 | 7.36 | 10.3 | 5.5 |
| 2015 | 7.91 | 17.64 | 4.58 |
| 2014 | 5.66 | 7.82 | 4.69 |
| 2013 | 6.4 | 8.62 | 4.7 |
| 2012 | 6.09 | 7.47 | 5.24 |
| 2011 | 8.51 | 10.95 | 5.93 |