| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.79 | 7.21 | 4.53 |
| 2024 | 5.58 | 7.96 | 4.02 |
| 2023 | 7.9 | 9.15 | 5.97 |
| 2022 | 6.98 | 8.44 | 4.99 |
| 2021 | 7.11 | 10.22 | 3.84 |
| 2020 | 3.93 | 5.41 | 2.47 |
| 2019 | 4.73 | 6.49 | 3.3 |
| 2018 | 5.87 | 6.63 | 5.14 |
| 2017 | 7.09 | 9.02 | 5.78 |
| 2016 | 7.56 | 10.45 | 5.55 |
| 2015 | 5.53 | 12.57 | 3.1 |
| 2014 | 3.11 | 3.99 | 2.51 |
| 2013 | 3.44 | 5.1 | 2.71 |
| 2012 | 1.99 | 2.5 | 1.61 |
| 2011 | 3.38 | 5.47 | 1.73 |
| 2010 | 6.3 | 8.89 | 4.98 |