| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.75 | 4.12 | 3.4 |
| 2024 | 3.73 | 4.72 | 3.22 |
| 2023 | 4.92 | 6.83 | 3.77 |
| 2022 | 6.65 | 9.68 | 4.72 |
| 2021 | 8.74 | 10.81 | 6.98 |
| 2020 | 5.77 | 9.21 | 4.42 |
| 2019 | 5.72 | 7.29 | 4.87 |
| 2018 | 6.18 | 7.16 | 4.69 |
| 2017 | 6.02 | 6.9 | 5.07 |
| 2016 | 6.39 | 7.62 | 5.11 |
| 2015 | 6.75 | 10.86 | 3.93 |
| 2014 | 3.53 | 5.05 | 2.56 |
| 2013 | 3.12 | 4.51 | 2.31 |
| 2012 | 4.14 | 5.4 | 2.93 |
| 2011 | 6.69 | 8.66 | 4.56 |
| 2010 | 5.47 | 7.91 | 3.84 |
| 2009 | 4.56 | 6.12 | 3.06 |
| 2008 | 2.81 | 4.75 | 1.36 |