| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.93 | 6.48 | 3.64 |
| 2023 | 6.58 | 10.28 | 3.99 |
| 2022 | 5.06 | 7.41 | 3.74 |
| 2021 | 8.97 | 11.72 | 7.12 |
| 2020 | 8.43 | 10.46 | 7.34 |
| 2019 | 8.5 | 11.24 | 6.93 |
| 2018 | 11.91 | 20.2 | 6.26 |
| 2017 | 15.79 | 22.01 | 10.45 |
| 2016 | 13.96 | 18.3 | 11.86 |
| 2015 | 22.57 | 36.87 | 13.57 |
| 2014 | 16.83 | 26.04 | 13.14 |
| 2013 | 22.29 | 35.44 | 14.45 |
| 2012 | 15.39 | 20.17 | 12.2 |
| 2011 | 21.37 | 36.68 | 15.02 |
| 2010 | 23.13 | 38.66 | 16.62 |
| 2009 | 17.56 | 23.7 | 12.41 |