| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.22 | 5.57 | 3.79 |
| 2024 | 4.37 | 5.51 | 2.96 |
| 2023 | 4.94 | 6.59 | 4.31 |
| 2022 | 4.47 | 5.94 | 3.76 |
| 2021 | 5.57 | 7.38 | 4.55 |
| 2020 | 4.46 | 6.1 | 3.25 |
| 2019 | 3.88 | 6.37 | 2.66 |
| 2018 | 3.47 | 4.32 | 2.62 |
| 2017 | 4.8 | 5.6 | 3.98 |
| 2016 | 6.18 | 7.69 | 5.08 |
| 2015 | 8.74 | 16.46 | 5.33 |
| 2014 | 2.93 | 6.22 | 1.74 |
| 2013 | 1.79 | 2.05 | 1.38 |
| 2012 | 2.18 | 2.9 | 1.32 |
| 2011 | 3.17 | 4.05 | 2.34 |
| 2010 | 3.31 | 4.88 | 2.25 |
| 2009 | 1.4 | 2.33 | 0.89 |
| 2008 | 1.36 | 2.7 | 0.56 |
| 2007 | 2.74 | 3.86 | 2.04 |