| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.8 | 4.18 | 3.38 |
| 2024 | 3.32 | 4.53 | 2.46 |
| 2023 | 3.99 | 5.53 | 3.54 |
| 2022 | 3.82 | 5 | 3.01 |
| 2021 | 4.24 | 5.15 | 3.34 |
| 2020 | 5.1 | 6.83 | 4.46 |
| 2019 | 7.16 | 10.93 | 5.33 |
| 2018 | 11.05 | 20.85 | 3.5 |
| 2017 | 15.52 | 22.88 | 8.82 |
| 2016 | 7.83 | 11.6 | 5.88 |
| 2015 | 8.29 | 19.32 | 4.88 |
| 2014 | 4.73 | 5.89 | 3.07 |
| 2013 | 2.63 | 3.55 | 2.04 |
| 2012 | 2.67 | 3.28 | 2 |
| 2011 | 3.46 | 4.43 | 2.7 |
| 2010 | 7.17 | 11.15 | 3.93 |