| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.91 | 4.55 | 3.64 |
| 2024 | 4.39 | 5.54 | 3.28 |
| 2023 | 5.92 | 9.71 | 4.11 |
| 2022 | 5.83 | 12.95 | 3.29 |
| 2021 | 3.49 | 4.4 | 2.75 |
| 2020 | 4.97 | 6.58 | 3.58 |
| 2019 | 3.22 | 4.08 | 2.74 |
| 2018 | 4.14 | 5.67 | 2.83 |
| 2017 | 5.7 | 6.41 | 5.12 |
| 2016 | 5.64 | 6.96 | 4.57 |
| 2015 | 6.79 | 9.7 | 5.19 |
| 2014 | 6.64 | 8.19 | 5.57 |
| 2013 | 7.65 | 9.61 | 5.93 |
| 2012 | 5.97 | 8.2 | 4.7 |
| 2011 | 6.83 | 8.93 | 5.41 |
| 2010 | 9.29 | 11.62 | 7.62 |