| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.21 | 8.49 | 5.97 |
| 2024 | 6.85 | 10.23 | 4.74 |
| 2023 | 12.7 | 18.2 | 9.87 |
| 2022 | 9.65 | 14.89 | 7.15 |
| 2021 | 10.44 | 13.48 | 7.66 |
| 2020 | 10.65 | 13.52 | 8.43 |
| 2019 | 11.25 | 13.78 | 8.93 |
| 2018 | 10.56 | 13.92 | 8.39 |
| 2017 | 9.37 | 11.36 | 7.81 |
| 2016 | 13.68 | 23.6 | 11.04 |
| 2015 | 17.36 | 31.64 | 9.43 |
| 2014 | 13.3 | 23.69 | 8.25 |
| 2013 | 11.5 | 20.19 | 7.51 |
| 2012 | 10.54 | 13.25 | 8.17 |
| 2011 | 16.59 | 24.95 | 11.55 |
| 2010 | 19.81 | 25.94 | 16.45 |
| 2009 | 16.14 | 18.97 | 13.06 |
| 2008 | 20.96 | 36.04 | 11.79 |