| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.05 | 7.2 | 2.63 |
| 2024 | 2.29 | 3.55 | 1.72 |
| 2023 | 2.53 | 3.15 | 2 |
| 2022 | 2.7 | 4.41 | 1.9 |
| 2021 | 2.88 | 4.49 | 1.98 |
| 2020 | 2.59 | 3.25 | 2.01 |
| 2019 | 2.43 | 3.37 | 1.72 |
| 2018 | 2.5 | 3.58 | 1.72 |
| 2017 | 4.44 | 5.93 | 2.87 |
| 2016 | 7.57 | 13.1 | 5.42 |
| 2015 | 19.44 | 36.89 | 8.63 |
| 2014 | 8.58 | 12.46 | 6.43 |
| 2013 | 5.94 | 7.62 | 4.7 |
| 2012 | 6.57 | 8.79 | 4.04 |
| 2011 | 11.07 | 18.94 | 6.83 |
| 2010 | 20.89 | 34.5 | 14.68 |