| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.05 | 2.61 | 1.8 |
| 2024 | 1.79 | 2.39 | 1.36 |
| 2023 | 1.95 | 2.26 | 1.71 |
| 2022 | 1.96 | 2.66 | 1.63 |
| 2021 | 2.11 | 2.58 | 1.88 |
| 2020 | 2.68 | 3.33 | 2.1 |
| 2019 | 2.33 | 4.91 | 1.3 |
| 2018 | 2.47 | 3.76 | 1.43 |
| 2017 | 6.22 | 10.61 | 3.52 |
| 2016 | 8.59 | 10.88 | 5.89 |
| 2015 | 12.55 | 23.79 | 7.9 |
| 2014 | 13.39 | 16.16 | 10.41 |
| 2013 | 8.69 | 10.69 | 6 |
| 2012 | 7.17 | 8.53 | 5.08 |