| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.86 | 6.92 | 5.04 |
| 2024 | 4.37 | 7.91 | 2.56 |
| 2023 | 3.66 | 4.42 | 2.79 |
| 2022 | 3.68 | 5.36 | 2.83 |
| 2021 | 5.11 | 6.41 | 3.89 |
| 2020 | 7.71 | 11.18 | 5.3 |
| 2019 | 6.75 | 10.91 | 3.16 |
| 2018 | 2.59 | 4.23 | 1.52 |
| 2017 | 3.82 | 5.63 | 2.75 |
| 2016 | 4.39 | 6.36 | 3.17 |
| 2015 | 5.11 | 8.32 | 3.15 |
| 2014 | 4.88 | 6.01 | 3.37 |
| 2013 | 4.24 | 5.79 | 3.31 |
| 2012 | 3.85 | 4.93 | 2.81 |
| 2011 | 6.45 | 8.52 | 4.21 |
| 2010 | 7.83 | 10.09 | 5.73 |
| 2009 | 6.51 | 8.13 | 4.85 |
| 2008 | 6.61 | 9.25 | 3.98 |