| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.51 | 3.98 | 3.19 |
| 2024 | 3.7 | 4.99 | 2.91 |
| 2023 | 5.86 | 7.55 | 3.79 |
| 2022 | 7.35 | 10.16 | 4.42 |
| 2021 | 6.82 | 10.35 | 4.29 |
| 2020 | 4.7 | 8.27 | 2.96 |
| 2019 | 3.66 | 4.66 | 2.84 |
| 2018 | 3.22 | 3.97 | 2.61 |
| 2017 | 5.53 | 7.51 | 3.75 |
| 2016 | 6.59 | 8.46 | 5.02 |
| 2015 | 8.38 | 14.54 | 4.73 |
| 2014 | 5.46 | 7.73 | 3.8 |
| 2013 | 3.77 | 4.54 | 3.22 |
| 2012 | 3.38 | 3.87 | 2.71 |
| 2011 | 4.14 | 5 | 2.85 |
| 2010 | 4.28 | 5.12 | 3.45 |