| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.42 | 7.83 | 5.49 |
| 2024 | 5.09 | 6.55 | 3.95 |
| 2023 | 5.65 | 7 | 4.61 |
| 2022 | 5.16 | 5.9 | 4.27 |
| 2021 | 6.35 | 9.4 | 4.67 |
| 2020 | 5.49 | 7.69 | 3.48 |
| 2019 | 3.48 | 4.32 | 2.58 |
| 2018 | 3.07 | 4.17 | 2.46 |
| 2017 | 5.16 | 8.22 | 3.72 |
| 2016 | 4.52 | 7.45 | 2.66 |
| 2015 | 3.09 | 5.12 | 1.78 |
| 2014 | 1.68 | 2.19 | 1.27 |
| 2013 | 2.19 | 2.95 | 1.58 |
| 2012 | 2.85 | 3.82 | 2 |
| 2011 | 4.41 | 6.26 | 2.51 |
| 2010 | 4.55 | 6.93 | 3.34 |
| 2009 | 3.91 | 5.54 | 2.05 |
| 2008 | 4.66 | 12.23 | 1.5 |
| 2007 | 7.85 | 12.89 | 3.39 |
| 2006 | 3.82 | 5.56 | 3.1 |
| 2005 | 2.84 | 4.47 | 1.97 |
| 2004 | 4.17 | 7.69 | 2.66 |