| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.81 | 4.31 | 2.83 |
| 2024 | 3.94 | 5.11 | 2.81 |
| 2023 | 3.45 | 3.98 | 2.91 |
| 2022 | 3.33 | 4.53 | 2.26 |
| 2021 | 6.49 | 10.37 | 4.19 |
| 2020 | 8.63 | 12.23 | 4.51 |
| 2019 | 3.91 | 5.08 | 2.5 |
| 2018 | 2.81 | 3.78 | 2.15 |
| 2017 | 4.34 | 5.97 | 3.21 |
| 2016 | 5.7 | 7.02 | 4.79 |
| 2015 | 7.81 | 10.6 | 5.07 |
| 2014 | 6.08 | 10.86 | 4.35 |
| 2013 | 4.86 | 6.78 | 3.3 |
| 2012 | 5.09 | 9 | 2.74 |
| 2011 | 10.19 | 13.04 | 7.89 |
| 2010 | 8.76 | 11.42 | 6.87 |
| 2009 | 5.95 | 8.53 | 4.84 |