| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.47 | 7.03 | 5.43 |
| 2024 | 7.9 | 10.15 | 6.11 |
| 2023 | 5.64 | 6.7 | 4.57 |
| 2022 | 4.5 | 6.04 | 3.23 |
| 2021 | 3.34 | 5.91 | 2.37 |
| 2020 | 3.43 | 4.96 | 2.24 |
| 2019 | 3.01 | 3.64 | 2.12 |
| 2018 | 2.61 | 3.73 | 1.78 |
| 2017 | 5.03 | 6.61 | 3.52 |
| 2016 | 16.69 | 40.56 | 6.32 |
| 2015 | 12.52 | 41.09 | 6.96 |
| 2014 | 5.33 | 7.04 | 3.86 |
| 2013 | 3.65 | 4.61 | 3.22 |
| 2012 | 3.42 | 4.76 | 2.79 |
| 2011 | 6.05 | 7.96 | 2.99 |
| 2010 | 7.1 | 9.07 | 5.13 |
| 2009 | 6.67 | 8.32 | 5.56 |