| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.05 | 6.53 | 5.39 |
| 2024 | 6.5 | 8.78 | 4.72 |
| 2023 | 7.54 | 8.49 | 6.81 |
| 2022 | 8.73 | 12 | 7.07 |
| 2021 | 10.64 | 13.37 | 7.61 |
| 2020 | 14.44 | 22.09 | 11.11 |
| 2019 | 16.04 | 21.66 | 11.16 |
| 2018 | 18.37 | 26.87 | 12.82 |
| 2017 | 19.34 | 27.45 | 14.7 |
| 2016 | 27.11 | 33.23 | 19.93 |
| 2015 | 25.74 | 39.43 | 15.06 |
| 2014 | 14.58 | 20.32 | 10.82 |
| 2013 | 13.1 | 16.14 | 10.13 |
| 2012 | 10.78 | 14.55 | 8.76 |
| 2011 | 20.32 | 24.77 | 12.55 |
| 2010 | 19.26 | 27.34 | 13.65 |
| 2009 | 10.67 | 16.66 | 4.4 |
| 2008 | 6.51 | 10.56 | 3.11 |
| 2007 | 10.01 | 13.54 | 6.9 |
| 2006 | 8.33 | 10.9 | 6.3 |
| 2005 | 7.69 | 10.32 | 5.94 |