| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.81 | 9.9 | 6.78 |
| 2024 | 6.3 | 14.51 | 4.18 |
| 2023 | 8.56 | 10.97 | 5.27 |
| 2022 | 8.02 | 11.04 | 5.37 |
| 2021 | 18.46 | 37.13 | 5.93 |
| 2020 | 22.96 | 61.19 | 15.31 |
| 2019 | 13.84 | 17.3 | 9.8 |
| 2018 | 8.96 | 12.92 | 7.16 |
| 2017 | 8.22 | 12.03 | 6.13 |
| 2016 | 10.56 | 14.37 | 7.36 |
| 2015 | 9.24 | 15.47 | 5.27 |
| 2014 | 5.56 | 7.24 | 4.62 |
| 2013 | 5.37 | 6.83 | 4.63 |
| 2012 | 7.47 | 10.75 | 4.7 |
| 2011 | 10.87 | 15.13 | 8.59 |
| 2010 | 11.26 | 15.15 | 8.37 |
| 2009 | 7.66 | 11.67 | 4.37 |
| 2008 | 7.24 | 13.27 | 2.65 |
| 2007 | 8.82 | 13.18 | 4.56 |
| 2006 | 5.87 | 7.24 | 4.18 |
| 2005 | 6.15 | 7.5 | 4.83 |
| 2004 | 12.72 | 24.94 | 6.17 |