| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.3 | 4.35 | 2.54 |
| 2023 | 5.78 | 7.67 | 3.78 |
| 2022 | 7.64 | 10.21 | 6.02 |
| 2021 | 12.33 | 15.16 | 9.22 |
| 2020 | 11.07 | 14.1 | 7.56 |
| 2019 | 6.36 | 8.68 | 3.92 |
| 2018 | 3.56 | 4.32 | 2.37 |
| 2017 | 3.36 | 4.03 | 2.95 |
| 2016 | 5.95 | 7.83 | 3.95 |
| 2015 | 8.04 | 13.78 | 4.03 |
| 2014 | 7.33 | 10.15 | 5.44 |
| 2013 | 5.9 | 7.7 | 4.26 |
| 2012 | 4.4 | 5.3 | 3.73 |
| 2011 | 4.68 | 6.54 | 3.61 |
| 2010 | 5.49 | 6.88 | 4.22 |