| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.56 | 6.69 | 5.18 |
| 2024 | 6.07 | 8 | 5.15 |
| 2023 | 4.81 | 5.6 | 4.21 |
| 2022 | 5.27 | 6.25 | 4.51 |
| 2021 | 4.77 | 6.53 | 4.08 |
| 2020 | 4.05 | 4.72 | 3.46 |
| 2019 | 3.79 | 4.08 | 3.45 |
| 2018 | 3.86 | 4.5 | 3.24 |
| 2017 | 3.97 | 5.3 | 2.84 |
| 2016 | 4.09 | 7.4 | 2.81 |
| 2015 | 3.17 | 8.23 | 2.01 |
| 2014 | 1.52 | 2.04 | 1.22 |
| 2013 | 1.6 | 2.08 | 1.36 |
| 2012 | 2.09 | 2.44 | 1.64 |
| 2011 | 2.79 | 3.85 | 2.03 |
| 2010 | 3.34 | 4.59 | 2.38 |
| 2009 | 4.23 | 5.22 | 3.1 |
| 2008 | 3.47 | 6.24 | 2.01 |
| 2007 | 5.12 | 7.02 | 2.37 |
| 2006 | 2.65 | 3.75 | 1.88 |
| 2005 | 4.65 | 6.33 | 2.46 |
| 2004 | 7.65 | 10.8 | 5.34 |