| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.61 | 5.59 | 3.67 |
| 2023 | 4.21 | 4.73 | 3.75 |
| 2022 | 4.08 | 5.79 | 3.12 |
| 2021 | 4.83 | 5.94 | 4.01 |
| 2020 | 6.16 | 8.84 | 4.45 |
| 2019 | 5.22 | 6.63 | 4.1 |
| 2018 | 5.5 | 7.41 | 4.09 |
| 2017 | 7.52 | 9 | 5.91 |
| 2016 | 8.95 | 10.38 | 7.31 |
| 2015 | 13.38 | 23.71 | 8 |
| 2014 | 9.47 | 11.32 | 7.8 |
| 2013 | 7.89 | 10.17 | 6 |
| 2012 | 6.78 | 7.95 | 5.35 |
| 2011 | 10.95 | 16.21 | 7.03 |
| 2010 | 14.03 | 17.42 | 9.86 |
| 2009 | 8.75 | 11.13 | 6.85 |