| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.51 | 5.46 | 3.88 |
| 2024 | 4.34 | 5.11 | 3.64 |
| 2023 | 5.66 | 6.6 | 4.97 |
| 2022 | 5.63 | 7.48 | 4.74 |
| 2021 | 7.38 | 11.16 | 6.27 |
| 2020 | 5.09 | 10.29 | 3.35 |
| 2019 | 3.91 | 4.68 | 3.05 |
| 2018 | 3.83 | 4.92 | 3.01 |
| 2017 | 5.04 | 5.96 | 4.52 |
| 2016 | 5.35 | 6.05 | 4.63 |
| 2015 | 6.75 | 11.97 | 4.78 |
| 2014 | 4.64 | 5.92 | 3.51 |
| 2013 | 5.01 | 5.9 | 4 |
| 2012 | 5.87 | 7.57 | 4.33 |
| 2011 | 6.67 | 8.97 | 5 |
| 2010 | 9.14 | 11.37 | 7.27 |
| 2009 | 6.7 | 9.96 | 4 |
| 2008 | 6.09 | 10.29 | 2.84 |
| 2007 | 7.18 | 9.8 | 4.36 |
| 2006 | 3.08 | 5.53 | 2.05 |
| 2005 | 2.32 | 3.13 | 1.34 |
| 2004 | 2.04 | 3.51 | 1.45 |