| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.96 | 4.72 | 3.51 |
| 2024 | 3.54 | 4.78 | 2.55 |
| 2023 | 4.74 | 5.27 | 4.2 |
| 2022 | 5.02 | 6.65 | 4.22 |
| 2021 | 5.27 | 7.26 | 4.43 |
| 2020 | 7.5 | 10.5 | 4.83 |
| 2019 | 4.76 | 6.67 | 4 |
| 2018 | 5.86 | 8.08 | 3.69 |
| 2017 | 9.49 | 12.9 | 7.44 |
| 2016 | 12.34 | 18.43 | 10.78 |
| 2015 | 17.34 | 27.97 | 6.9 |
| 2014 | 4.3 | 6.73 | 3 |
| 2013 | 3.03 | 3.82 | 2.39 |
| 2012 | 2.67 | 3.42 | 2.07 |
| 2011 | 3.5 | 4.03 | 2.62 |
| 2010 | 4.33 | 6.19 | 2.92 |
| 2009 | 5.51 | 8.47 | 3.57 |
| 2008 | 4.8 | 6.67 | 2.13 |