| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.24 | 3.46 | 3.13 |
| 2024 | 3.31 | 4.02 | 2.88 |
| 2023 | 4.43 | 5.58 | 3.38 |
| 2022 | 3.72 | 4.44 | 3.02 |
| 2021 | 3.76 | 4.33 | 3.13 |
| 2020 | 3.59 | 4.26 | 2.86 |
| 2019 | 3.81 | 4.29 | 3.42 |
| 2018 | 3.68 | 4.4 | 3.22 |
| 2017 | 4.69 | 5.55 | 4.08 |
| 2016 | 4.35 | 4.84 | 3.64 |
| 2015 | 5.41 | 8.96 | 3.46 |
| 2014 | 3.86 | 6.65 | 3.18 |
| 2013 | 3.52 | 3.89 | 3 |
| 2012 | 3.74 | 4.25 | 3.22 |
| 2011 | 4.94 | 6.11 | 3.73 |
| 2010 | 6.66 | 8.31 | 5.38 |
| 2009 | 7.16 | 8.98 | 5.46 |
| 2008 | 11.94 | 20.27 | 6.56 |
| 2007 | 12.74 | 16.99 | 7.51 |
| 2006 | 7.78 | 10.7 | 6.31 |
| 2005 | 7 | 9.19 | 5.28 |
| 2004 | 9.05 | 17.11 | 5.4 |