| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.86 | 4.66 | 3.17 |
| 2023 | 4.9 | 6.54 | 4.26 |
| 2022 | 5.49 | 8.5 | 4.1 |
| 2021 | 10.22 | 13.5 | 7.7 |
| 2020 | 7.65 | 9.6 | 5.53 |
| 2019 | 7.87 | 10.35 | 5.65 |
| 2018 | 10.73 | 15.18 | 6.54 |
| 2017 | 10.76 | 15.08 | 6.85 |
| 2016 | 7.01 | 8.46 | 5.76 |
| 2015 | 8.87 | 13.37 | 7.48 |
| 2014 | 6.95 | 9.63 | 5.23 |
| 2013 | 9.28 | 12.31 | 7.57 |
| 2012 | 7.26 | 8.61 | 5.85 |
| 2011 | 6.94 | 8.17 | 5.63 |