| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.87 | 7.31 | 4.49 |
| 2024 | 6.14 | 11.51 | 3.39 |
| 2023 | 5.55 | 7.74 | 4.03 |
| 2022 | 4.09 | 5.86 | 3.12 |
| 2021 | 4.21 | 5.21 | 3.18 |
| 2020 | 5.18 | 7.54 | 4.17 |
| 2019 | 7.55 | 11.69 | 4.77 |
| 2018 | 5.64 | 8.21 | 3.68 |
| 2017 | 9.12 | 12.91 | 7.15 |
| 2016 | 9.1 | 13.23 | 4.86 |
| 2015 | 4.85 | 7.3 | 2.89 |
| 2014 | 4.49 | 6.38 | 2.93 |
| 2013 | 2.67 | 5.75 | 1.89 |
| 2012 | 2.35 | 3.11 | 1.74 |
| 2011 | 5.18 | 11.62 | 2.26 |
| 2010 | 7.37 | 9.37 | 5.28 |
| 2009 | 4.93 | 7.41 | 3.03 |
| 2008 | 3.2 | 5.03 | 1.82 |