| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.64 | 4.53 | 2.6 |
| 2024 | 2.86 | 3.47 | 1.97 |
| 2023 | 3.73 | 5.14 | 2.94 |
| 2022 | 2.85 | 3.82 | 1.79 |
| 2021 | 3.58 | 4.7 | 3.09 |
| 2020 | 4.65 | 5.56 | 3.83 |
| 2019 | 5.24 | 6.7 | 4.07 |
| 2018 | 5.71 | 8.09 | 3.98 |
| 2017 | 9.78 | 15.37 | 6.66 |
| 2016 | 17.64 | 23.57 | 14.64 |
| 2015 | 15.56 | 27.84 | 8.78 |
| 2014 | 10.13 | 12.16 | 8.2 |
| 2013 | 7.33 | 10.8 | 5.55 |
| 2012 | 6.41 | 8.19 | 4.86 |
| 2011 | 10.73 | 13.49 | 7.98 |