| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.16 | 4.91 | 3.4 |
| 2023 | 4.82 | 5.48 | 3.89 |
| 2022 | 4.73 | 6.63 | 3.44 |
| 2021 | 7.24 | 9.02 | 5.85 |
| 2020 | 7.02 | 10.03 | 5.88 |
| 2019 | 6.51 | 8.31 | 4.75 |
| 2018 | 6.23 | 7.74 | 4.64 |
| 2017 | 8.37 | 9.88 | 7.1 |
| 2016 | 8.37 | 9.93 | 6 |
| 2015 | 8.86 | 16.06 | 5.71 |
| 2014 | 6.31 | 7.64 | 4.99 |
| 2013 | 6.48 | 8.39 | 5.47 |
| 2012 | 6.06 | 7.62 | 4.86 |
| 2011 | 8.74 | 13.25 | 5.24 |
| 2010 | 9.63 | 12.71 | 7.1 |
| 2009 | 6.19 | 9.1 | 4.24 |
| 2008 | 7.85 | 17.32 | 2.71 |