| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.5 | 10.17 | 6.02 |
| 2024 | 6.42 | 10.01 | 4.7 |
| 2023 | 10.45 | 13.34 | 8.87 |
| 2022 | 11.38 | 14.96 | 6.98 |
| 2021 | 10.47 | 13.2 | 8.59 |
| 2020 | 9.33 | 13.52 | 6.2 |
| 2019 | 7.49 | 10.42 | 6.13 |
| 2018 | 8.59 | 12.27 | 5.76 |
| 2017 | 13.18 | 16.28 | 10.6 |
| 2016 | 17.95 | 20.8 | 13.82 |
| 2015 | 16.86 | 25.74 | 8.61 |
| 2014 | 12.3 | 15.4 | 9.05 |
| 2013 | 9.2 | 12.38 | 6.37 |
| 2012 | 11.89 | 17.02 | 6.97 |
| 2011 | 16.55 | 23.55 | 12.98 |
| 2010 | 22.96 | 28.93 | 15.17 |
| 2009 | 14.92 | 16.97 | 12.35 |