| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.53 | 1.88 | 1.32 |
| 2024 | 1.57 | 2.11 | 1.21 |
| 2023 | 2.07 | 3.3 | 1.38 |
| 2022 | 1.96 | 3.11 | 1.37 |
| 2021 | 3.38 | 4.32 | 2.9 |
| 2020 | 3.73 | 4.77 | 2.85 |
| 2019 | 3.67 | 4.8 | 2.8 |
| 2018 | 5.5 | 9.24 | 2.83 |
| 2017 | 7.11 | 9.02 | 5.1 |
| 2016 | 6.03 | 7.06 | 5.1 |
| 2015 | 7.56 | 10.42 | 5.25 |
| 2014 | 7.44 | 13.5 | 4.7 |
| 2013 | 16.3 | 22.53 | 12.35 |
| 2012 | 11.28 | 14.62 | 8.38 |
| 2011 | 9.91 | 11.79 | 8.11 |
| 2010 | 8.82 | 12.79 | 5.42 |
| 2009 | 4.29 | 6.34 | 3.57 |