| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.08 | 3.34 | 2.92 |
| 2024 | 3.33 | 4.05 | 2.71 |
| 2023 | 3.22 | 3.91 | 2.72 |
| 2022 | 2.76 | 3.49 | 2.31 |
| 2021 | 3.22 | 4.13 | 2.4 |
| 2020 | 3.48 | 4.89 | 2.47 |
| 2019 | 3.12 | 3.58 | 2.58 |
| 2018 | 3.75 | 4.92 | 2.63 |
| 2017 | 4.67 | 5.66 | 4.23 |
| 2016 | 4.48 | 5.37 | 3.68 |
| 2015 | 5.71 | 10.31 | 4.06 |
| 2014 | 3.69 | 4.82 | 3.13 |
| 2013 | 3.57 | 4.17 | 3.09 |
| 2012 | 3.58 | 4.11 | 2.74 |
| 2011 | 5.19 | 6.76 | 4.1 |
| 2010 | 6.13 | 7.19 | 4.34 |
| 2009 | 4.35 | 6.26 | 3.22 |
| 2008 | 4.19 | 8.71 | 2.31 |
| 2007 | 6.03 | 7.95 | 3.17 |
| 2006 | 3.18 | 4.06 | 2.54 |
| 2005 | 3.18 | 3.83 | 2.85 |