| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.08 | 5.99 | 3.56 |
| 2024 | 6 | 10.33 | 3.88 |
| 2023 | 7.93 | 10.25 | 5.84 |
| 2022 | 4.28 | 6.55 | 2.62 |
| 2021 | 2.72 | 4.43 | 1.88 |
| 2020 | 3.31 | 4.15 | 2.42 |
| 2019 | 2.5 | 3.36 | 1.52 |
| 2018 | 1.9 | 3.29 | 1.37 |
| 2017 | 4.44 | 7.09 | 3.29 |
| 2016 | 6.16 | 8.41 | 4.72 |
| 2015 | 6.51 | 10.25 | 3.99 |
| 2014 | 3.42 | 5.4 | 1.96 |
| 2013 | 1.97 | 2.7 | 1.54 |
| 2012 | 2.23 | 3.1 | 1.52 |
| 2011 | 4.05 | 5.39 | 1.86 |
| 2010 | 3.79 | 5.39 | 2.69 |
| 2009 | 2.9 | 3.64 | 2.19 |
| 2008 | 4.67 | 8.21 | 1.82 |
| 2007 | 6.26 | 8.61 | 4.1 |
| 2006 | 3.78 | 6.32 | 1.94 |
| 2005 | 3 | 4.13 | 1.8 |
| 2004 | 2.96 | 6.06 | 2.6 |