| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.29 | 3.58 | 2.89 |
| 2024 | 3 | 4.11 | 2.15 |
| 2023 | 5.11 | 8.04 | 3.24 |
| 2022 | 6.17 | 8.02 | 4.05 |
| 2021 | 5.97 | 9.14 | 4.25 |
| 2020 | 5.21 | 7.47 | 4.01 |
| 2019 | 4.91 | 7.04 | 3.92 |
| 2018 | 4.41 | 6.03 | 3.45 |
| 2017 | 7.57 | 9.92 | 5.34 |
| 2016 | 5.86 | 9.84 | 2.89 |
| 2015 | 4.47 | 7.75 | 2.67 |
| 2014 | 4.1 | 4.87 | 3.61 |
| 2013 | 5.72 | 8.48 | 4.25 |
| 2012 | 7.65 | 11.68 | 5.26 |
| 2011 | 13.63 | 18.03 | 11.63 |