| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.22 | 6.95 | 5.66 |
| 2024 | 6.54 | 8.83 | 5.57 |
| 2023 | 12.46 | 20.92 | 6.03 |
| 2022 | 12.91 | 21.34 | 7.5 |
| 2021 | 7.63 | 10.58 | 5.72 |
| 2020 | 5.9 | 8.1 | 4.09 |
| 2019 | 4.94 | 5.9 | 4.35 |
| 2018 | 5.9 | 7.12 | 4.29 |
| 2017 | 7.41 | 8.5 | 6.66 |
| 2016 | 7.37 | 9.08 | 6.16 |
| 2015 | 7.99 | 12.62 | 5.98 |
| 2014 | 5.32 | 6.42 | 3.84 |
| 2013 | 4.32 | 5.07 | 3.63 |
| 2012 | 6.5 | 12.96 | 3.33 |
| 2011 | 15.44 | 20.31 | 9.57 |
| 2010 | 13.3 | 21.78 | 9.58 |
| 2009 | 9.38 | 11.37 | 6.79 |
| 2008 | 11.35 | 22.92 | 5.36 |
| 2007 | 16.17 | 21.82 | 10.7 |
| 2006 | 9.36 | 11.71 | 6.87 |
| 2005 | 9.27 | 11.93 | 6.61 |