| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 5.69 | 6.06 | 4.96 |
| 2025 | 5.06 | 6.38 | 3.99 |
| 2024 | 3.76 | 6.95 | 3.03 |
| 2023 | 4.2 | 5.16 | 3.63 |
| 2022 | 3.92 | 4.57 | 3.33 |
| 2021 | 3.74 | 4.61 | 3.24 |
| 2020 | 3.76 | 5.18 | 2.92 |
| 2019 | 3.54 | 4.26 | 3.11 |
| 2018 | 3.77 | 5.29 | 2.87 |
| 2017 | 5.93 | 8.66 | 4.72 |
| 2016 | 6.31 | 8.47 | 4.68 |
| 2015 | 8.8 | 14.72 | 5.64 |
| 2014 | 5.62 | 7.56 | 4.71 |
| 2013 | 8.21 | 10.09 | 6.21 |
| 2012 | 7.56 | 9.41 | 6.26 |
| 2011 | 9.6 | 12.03 | 7.09 |