| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 15.9 | 19.03 | 14.06 |
| 2022 | 14.87 | 23.61 | 10.21 |
| 2021 | 34.91 | 63.7 | 19.05 |
| 2020 | 30.85 | 40.95 | 20.5 |
| 2019 | 20.48 | 31.08 | 14.62 |
| 2018 | 25.81 | 47.39 | 16.46 |
| 2017 | 36.94 | 56.48 | 24.78 |
| 2016 | 53.06 | 85.62 | 28.23 |
| 2015 | 40.22 | 69.17 | 28.01 |
| 2014 | 22.82 | 33.81 | 14.19 |
| 2013 | 14.52 | 17.74 | 10.68 |
| 2012 | 16.8 | 18.82 | 14.82 |
| 2011 | 21.69 | 27.51 | 14.94 |
| 2010 | 29.32 | 42.22 | 19.39 |
| 2009 | 43.46 | 53.73 | 35.95 |