| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.43 | 2.7 | 2.14 |
| 2024 | 2.15 | 3.01 | 1.71 |
| 2023 | 2.81 | 3.37 | 2.46 |
| 2022 | 2.83 | 3.68 | 2.23 |
| 2021 | 4 | 4.95 | 2.83 |
| 2020 | 3.75 | 4.85 | 2.76 |
| 2019 | 3.8 | 4.9 | 3.2 |
| 2018 | 7.3 | 13.76 | 3.54 |
| 2017 | 13.33 | 20.58 | 10.25 |
| 2016 | 9.87 | 11.67 | 7.04 |
| 2015 | 8.78 | 14.97 | 5.32 |
| 2014 | 3.95 | 6.57 | 3.05 |
| 2013 | 3.07 | 3.83 | 2.57 |
| 2012 | 3.62 | 5.05 | 2.43 |
| 2011 | 7.58 | 12.12 | 4.1 |
| 2010 | 7.06 | 8.28 | 5.94 |