| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.03 | 5.69 | 4.13 |
| 2024 | 4.81 | 6.73 | 4.03 |
| 2023 | 4.97 | 5.52 | 4.43 |
| 2022 | 5.39 | 7.17 | 4.22 |
| 2021 | 7.1 | 8.8 | 5.75 |
| 2020 | 10.63 | 14.67 | 8.08 |
| 2019 | 16.79 | 25.56 | 10.3 |
| 2018 | 13.15 | 17.13 | 9.42 |
| 2017 | 15.96 | 18.87 | 12.87 |
| 2016 | 10.93 | 18.76 | 7.21 |
| 2015 | 22.69 | 40.62 | 7.84 |
| 2014 | 16.44 | 35.47 | 11.73 |
| 2013 | 15.95 | 18.82 | 13.21 |
| 2012 | 14 | 17 | 8.93 |
| 2011 | 11.56 | 14.13 | 9.07 |
| 2010 | 15.63 | 27.25 | 11.01 |
| 2009 | 22.48 | 37.74 | 8.11 |
| 2008 | 33.54 | 314.03 | 7.09 |
| 2007 | 48.65 | 271.67 | 4.75 |
| 2006 | 6.16 | 8.44 | 4.47 |