| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.5 | 4.14 | 3.16 |
| 2024 | 3.63 | 5.59 | 2.97 |
| 2023 | 3.99 | 4.46 | 3.61 |
| 2022 | 3.75 | 4.65 | 3.09 |
| 2021 | 2.97 | 3.72 | 2.3 |
| 2020 | 3.18 | 3.59 | 2.64 |
| 2019 | 3.02 | 4.19 | 2.54 |
| 2018 | 4.14 | 6.04 | 2.68 |
| 2017 | 7.55 | 10.5 | 5.81 |
| 2016 | 9.13 | 12.24 | 7.86 |
| 2015 | 9.66 | 14.63 | 6.98 |
| 2014 | 9.07 | 17.26 | 5.06 |
| 2013 | 11.21 | 17.51 | 5.57 |
| 2012 | 6.89 | 8.41 | 5.04 |
| 2011 | 9.45 | 13.04 | 7.24 |