| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.06 | 3.75 | 2.53 |
| 2024 | 2.92 | 3.69 | 2.24 |
| 2023 | 3.83 | 4.68 | 3.44 |
| 2022 | 3.54 | 4.83 | 2.86 |
| 2021 | 4.07 | 5.2 | 3.23 |
| 2020 | 4.5 | 5.94 | 3.2 |
| 2019 | 3.03 | 3.85 | 2.45 |
| 2018 | 3.41 | 4.9 | 2.55 |
| 2017 | 4.45 | 5.05 | 3.75 |
| 2016 | 5.97 | 7.42 | 4.57 |
| 2015 | 9.01 | 15.37 | 5.86 |
| 2014 | 6.15 | 7.9 | 4.71 |
| 2013 | 4.71 | 6.66 | 3.6 |
| 2012 | 4.46 | 5.7 | 3.34 |
| 2011 | 7.71 | 11.25 | 5.14 |
| 2010 | 8.37 | 11.57 | 6.37 |
| 2009 | 7.53 | 8.48 | 6.37 |
| 2008 | 9.01 | 15.38 | 5.63 |