| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.41 | 7.64 | 3.45 |
| 2024 | 4.61 | 7.4 | 3.03 |
| 2023 | 7.12 | 11.43 | 4.77 |
| 2022 | 10.84 | 14.95 | 6.73 |
| 2021 | 5.71 | 15.54 | 2.55 |
| 2020 | 2.5 | 3.45 | 1.83 |
| 2019 | 2.39 | 3.03 | 1.97 |
| 2018 | 2.73 | 3.66 | 2.01 |
| 2017 | 4.07 | 5.77 | 3.18 |
| 2016 | 6.84 | 7.83 | 5.34 |
| 2015 | 5.83 | 9.21 | 3.57 |
| 2014 | 3.96 | 4.99 | 3.07 |
| 2013 | 3.62 | 4.32 | 3.12 |
| 2012 | 4.49 | 7.48 | 2.36 |
| 2011 | 14.95 | 23.62 | 4.82 |
| 2010 | 7.84 | 22.42 | 4.56 |
| 2009 | 6.24 | 8.37 | 2.49 |
| 2008 | 4.24 | 6.85 | 1.85 |
| 2007 | 3.11 | 5.35 | 1.41 |
| 2006 | 1.52 | 1.86 | 1.26 |
| 2005 | 1.73 | 2.18 | 1.23 |