| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 13.97 | 15.2 | 12.46 |
| 2024 | 12.07 | 18.18 | 7.83 |
| 2023 | 14.97 | 17.26 | 13.16 |
| 2022 | 16.72 | 25.21 | 12.41 |
| 2021 | 13.7 | 29.46 | 4.84 |
| 2020 | 6.56 | 11.49 | 3.25 |
| 2019 | 10.23 | 13.16 | 7.44 |
| 2018 | 11.53 | 16.64 | 6.81 |
| 2017 | 15.41 | 19.94 | 12.61 |
| 2016 | 19.03 | 33.06 | 8.19 |
| 2015 | 12.4 | 24.52 | 5.88 |
| 2014 | 5.41 | 8.06 | 3.77 |
| 2013 | 3.62 | 4.97 | 2.49 |
| 2012 | 4.07 | 4.96 | 2.95 |
| 2011 | 9.03 | 14 | 3.7 |
| 2010 | 6.23 | 9.09 | 4.81 |
| 2009 | 5.18 | 6.89 | 3.08 |
| 2008 | 2.8 | 4.59 | 1.8 |