| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.33 | 7.95 | 5.33 |
| 2024 | 4.11 | 5.88 | 2.66 |
| 2023 | 6.78 | 11.32 | 4.34 |
| 2022 | 8.28 | 11.45 | 4.72 |
| 2021 | 7.77 | 9.71 | 6.3 |
| 2020 | 8.94 | 11.14 | 6.08 |
| 2019 | 5.31 | 7.07 | 3.98 |
| 2018 | 6.49 | 9.56 | 3.64 |
| 2017 | 13.17 | 16.17 | 9.47 |
| 2016 | 13.12 | 16.19 | 8.33 |
| 2015 | 9.15 | 14.03 | 5.62 |
| 2014 | 7 | 8.73 | 5.08 |
| 2013 | 4.77 | 7.06 | 3.75 |
| 2012 | 5.12 | 6.79 | 3.41 |
| 2011 | 9.54 | 15.01 | 5.17 |
| 2010 | 8.41 | 16.24 | 5.39 |
| 2009 | 4.44 | 6.15 | 3.54 |
| 2008 | 6.25 | 17.93 | 2.37 |