| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.24 | 3.93 | 2.52 |
| 2023 | 3.99 | 5.08 | 3.56 |
| 2022 | 4.19 | 6.35 | 3.19 |
| 2021 | 7.98 | 10.79 | 5.74 |
| 2020 | 5.85 | 7.67 | 4.49 |
| 2019 | 5.66 | 7.18 | 4.39 |
| 2018 | 7.46 | 10.61 | 4.54 |
| 2017 | 7.66 | 10.3 | 4.95 |
| 2016 | 5.13 | 5.88 | 4.24 |
| 2015 | 7.15 | 11.24 | 5.51 |
| 2014 | 6.83 | 10.22 | 5.17 |
| 2013 | 10.6 | 13.44 | 8.88 |
| 2012 | 9.1 | 11.02 | 7.77 |
| 2011 | 9.97 | 12.27 | 8.49 |