| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.78 | 5.46 | 3.98 |
| 2024 | 3.41 | 4.61 | 2.47 |
| 2023 | 3.98 | 4.97 | 3.5 |
| 2022 | 4.02 | 5.6 | 3.01 |
| 2021 | 4.91 | 8.6 | 3.35 |
| 2020 | 5.32 | 7.41 | 3.87 |
| 2019 | 5.28 | 9.34 | 3.05 |
| 2018 | 4.25 | 5.57 | 3.07 |
| 2017 | 5.6 | 6.81 | 4.73 |
| 2016 | 6.45 | 8.46 | 5.7 |
| 2015 | 5.92 | 12.95 | 3.76 |
| 2014 | 2.72 | 4.27 | 1.97 |
| 2013 | 2.05 | 2.29 | 1.79 |
| 2012 | 2.24 | 2.77 | 1.59 |
| 2011 | 3.03 | 4.16 | 2 |
| 2010 | 3.81 | 5.25 | 3.05 |
| 2009 | 2.4 | 3.38 | 1.53 |
| 2008 | 2.2 | 4.01 | 1.02 |