| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.11 | 9.45 | 5.14 |
| 2024 | 4.49 | 9.44 | 2.87 |
| 2023 | 5.06 | 6 | 3.83 |
| 2022 | 4.32 | 5.05 | 3.43 |
| 2021 | 4.84 | 5.68 | 4.22 |
| 2020 | 5.52 | 6.8 | 3.97 |
| 2019 | 5.6 | 10.84 | 3.72 |
| 2018 | 4.96 | 6.88 | 3.04 |
| 2017 | 7.47 | 8.84 | 6.32 |
| 2016 | 9.13 | 10.86 | 6.9 |
| 2015 | 7.99 | 12.97 | 4.29 |
| 2014 | 4.91 | 7.18 | 3.09 |
| 2013 | 3.21 | 4.15 | 2.25 |
| 2012 | 2.62 | 3.57 | 2.01 |
| 2011 | 4.39 | 5.99 | 2.72 |
| 2010 | 5.44 | 6.98 | 4.22 |
| 2009 | 6.39 | 7.72 | 4.4 |
| 2008 | 7.06 | 14.18 | 2.38 |
| 2007 | 5.58 | 9.23 | 2.96 |
| 2006 | 3.4 | 4.11 | 2.89 |
| 2005 | 3.48 | 4.96 | 2.58 |
| 2004 | 4.48 | 7.1 | 3.15 |