| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.75 | 4.92 | 2.3 |
| 2024 | 2.48 | 3.18 | 1.93 |
| 2023 | 3.74 | 6.31 | 2.79 |
| 2022 | 3.98 | 7.42 | 2.7 |
| 2021 | 7.49 | 10.03 | 5.54 |
| 2020 | 10.43 | 15.25 | 7.05 |
| 2019 | 7.06 | 8.91 | 5.41 |
| 2018 | 7 | 8.86 | 4.33 |
| 2017 | 5.53 | 7.46 | 4.16 |
| 2016 | 12.14 | 23.65 | 7.29 |
| 2015 | 34.92 | 66.87 | 17.84 |
| 2014 | 16.24 | 25.11 | 12.14 |
| 2013 | 8.52 | 13.47 | 4.55 |
| 2012 | 4.43 | 4.85 | 4.07 |