| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.77 | 8.46 | 3.89 |
| 2024 | 4.1 | 5.03 | 3.07 |
| 2023 | 3.91 | 5.9 | 2.96 |
| 2022 | 2.96 | 5.06 | 2.23 |
| 2021 | 2.93 | 3.77 | 2.55 |
| 2020 | 4.23 | 5.31 | 2.91 |
| 2019 | 5.75 | 8.87 | 4.14 |
| 2018 | 7.45 | 10.1 | 5.64 |
| 2017 | 7.28 | 8.48 | 6.23 |
| 2016 | 5.37 | 7.36 | 4.07 |
| 2015 | 7.85 | 11.2 | 5.03 |
| 2014 | 8.09 | 12.84 | 5.45 |
| 2013 | 8.82 | 16.93 | 4.04 |
| 2012 | 4.59 | 6.39 | 3.2 |
| 2011 | 8.8 | 14.92 | 5.45 |
| 2010 | 2.98 | 3.31 | 2.66 |
| 2009 | 2.88 | 3.95 | 1.7 |
| 2008 | 2.82 | 5.27 | 1.45 |
| 2007 | 5.01 | 8.39 | 2.79 |
| 2006 | 2.8 | 3.61 | 1.95 |
| 2005 | 2.57 | 3.77 | 1.51 |
| 2004 | 3.13 | 6.06 | 1.85 |