| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2021 | 33.44 | 35.4 | 31.6 |
| 2020 | 42.76 | 62.24 | 32.57 |
| 2019 | 49.61 | 62.71 | 34.34 |
| 2018 | 47.46 | 60.88 | 36.9 |
| 2017 | 49.22 | 66.93 | 37.62 |
| 2016 | 50.16 | 64.91 | 38.04 |
| 2015 | 48.54 | 73.15 | 33.32 |
| 2014 | 30.66 | 38.16 | 25.37 |
| 2013 | 34.78 | 51.72 | 25.69 |
| 2012 | 46.3 | 58.61 | 36.04 |
| 2011 | 56.43 | 71.73 | 45.5 |