| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.74 | 6.17 | 3.8 |
| 2024 | 3.25 | 6.27 | 2.06 |
| 2023 | 2.78 | 3.39 | 2.28 |
| 2022 | 2.43 | 3.16 | 1.7 |
| 2021 | 2.82 | 3.93 | 2.27 |
| 2020 | 4.73 | 6.56 | 3.24 |
| 2019 | 5.16 | 15.78 | 1.61 |
| 2018 | 4.87 | 9.86 | 1.67 |
| 2017 | 9.74 | 17 | 6.88 |
| 2016 | 10.69 | 15.87 | 6.79 |
| 2015 | 12.92 | 25.49 | 8.2 |
| 2014 | 7.82 | 11.09 | 5.13 |
| 2013 | 7.68 | 10.27 | 6.03 |
| 2012 | 7.62 | 9.82 | 5.55 |
| 2011 | 10.55 | 13.31 | 8.24 |