| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.26 | 6.92 | 5.75 |
| 2024 | 6.55 | 10.47 | 4.71 |
| 2023 | 4.48 | 7.24 | 3.03 |
| 2022 | 3.28 | 4.8 | 2.55 |
| 2021 | 5.18 | 7.57 | 3.82 |
| 2020 | 6.5 | 8.75 | 5.38 |
| 2019 | 7.03 | 13.72 | 4.59 |
| 2018 | 5.57 | 7.64 | 3.84 |
| 2017 | 10.17 | 14.94 | 6.3 |
| 2016 | 13.91 | 16.38 | 9.63 |
| 2015 | 12.19 | 23.71 | 6.39 |
| 2014 | 5.16 | 8.1 | 3.72 |
| 2013 | 4.02 | 6.64 | 2.55 |
| 2012 | 3.26 | 4.68 | 2.19 |
| 2011 | 3.86 | 5.31 | 3.12 |
| 2010 | 4.13 | 5.18 | 3.01 |
| 2009 | 3.17 | 4.27 | 2.29 |
| 2008 | 5.18 | 11.26 | 1.62 |
| 2007 | 9.27 | 13.07 | 7.09 |
| 2006 | 6.92 | 9.21 | 5.36 |
| 2005 | 5.51 | 7.22 | 4.06 |
| 2004 | 6 | 9.73 | 3.94 |