| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.74 | 7.92 | 4 |
| 2024 | 4.6 | 8.76 | 2.85 |
| 2023 | 7.89 | 15.15 | 4.78 |
| 2022 | 9.03 | 17.07 | 3.02 |
| 2021 | 3.3 | 4.9 | 1.87 |
| 2020 | 2.42 | 3.13 | 2.03 |
| 2019 | 3.39 | 4.5 | 2.7 |
| 2018 | 3.69 | 4.95 | 3.14 |
| 2017 | 4.82 | 5.37 | 4.14 |
| 2016 | 5.81 | 7.74 | 4.15 |
| 2015 | 5.42 | 11.02 | 3.19 |
| 2014 | 4.78 | 8.29 | 3.23 |
| 2013 | 2.85 | 3.97 | 2.27 |
| 2012 | 2.39 | 3.01 | 1.93 |
| 2011 | 3.48 | 4.9 | 2.24 |