| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.19 | 6.18 | 4.33 |
| 2024 | 4.05 | 8.35 | 2.93 |
| 2023 | 5.97 | 8.21 | 5.18 |
| 2022 | 3.99 | 8.14 | 2.97 |
| 2021 | 3.89 | 5.72 | 3.31 |
| 2020 | 5.67 | 7.1 | 3.94 |
| 2019 | 7.18 | 10.45 | 5.15 |
| 2018 | 10.36 | 16.12 | 5.87 |
| 2017 | 11.26 | 14.14 | 9.28 |
| 2016 | 25.16 | 37.05 | 12.3 |
| 2015 | 33.78 | 63.01 | 13.4 |
| 2014 | 11.32 | 15.77 | 7.92 |
| 2013 | 8.21 | 14.16 | 4.15 |
| 2012 | 4.48 | 5.66 | 3.69 |
| 2011 | 6.19 | 8.63 | 4.24 |
| 2010 | 8.62 | 9.97 | 6.67 |
| 2009 | 5.94 | 8.61 | 3.78 |
| 2008 | 7.72 | 16.5 | 2.16 |
| 2007 | 12.15 | 15.83 | 9.33 |