| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.92 | 3.22 | 2.68 |
| 2024 | 2.58 | 3.24 | 1.78 |
| 2023 | 2.83 | 3.24 | 2.48 |
| 2022 | 3.29 | 4.1 | 2.6 |
| 2021 | 4.59 | 5.94 | 3.44 |
| 2020 | 6.29 | 8.59 | 4.91 |
| 2019 | 5.57 | 8.19 | 4.1 |
| 2018 | 7.77 | 10.55 | 5.31 |
| 2017 | 10.98 | 12.49 | 7.88 |
| 2016 | 10.06 | 11.9 | 9.16 |
| 2015 | 12.19 | 18.35 | 8.55 |
| 2014 | 11.46 | 15.22 | 9.02 |
| 2013 | 9.15 | 10.85 | 7.58 |
| 2012 | 7.84 | 9.51 | 6.03 |
| 2011 | 7.98 | 13.55 | 6.3 |