| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.37 | 3.49 | 3.02 |
| 2024 | 3.64 | 4.37 | 3.26 |
| 2023 | 3.46 | 3.98 | 3.06 |
| 2022 | 4.82 | 6.96 | 3.58 |
| 2021 | 7.25 | 10.37 | 5.11 |
| 2020 | 7.29 | 8.42 | 5.9 |
| 2019 | 5.29 | 6.91 | 3.42 |
| 2018 | 5.73 | 10.54 | 3.35 |
| 2017 | 5.08 | 9.69 | 3.93 |
| 2016 | 5.44 | 6.65 | 3.6 |
| 2015 | 4.54 | 7.44 | 3.47 |
| 2014 | 3.58 | 4.08 | 3.09 |
| 2013 | 3.62 | 4.31 | 2.74 |
| 2012 | 3.79 | 4.27 | 3.25 |
| 2011 | 5.33 | 7.35 | 3.44 |
| 2010 | 5.67 | 7.46 | 3.53 |
| 2009 | 4.41 | 7.01 | 2.41 |
| 2008 | 5.56 | 9.32 | 1.81 |
| 2007 | 2.73 | 6.72 | 1.17 |
| 2006 | 1.4 | 1.91 | 1.13 |
| 2005 | 1.07 | 1.35 | 0.73 |