| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 20.62 | 25.73 | 15.69 |
| 2024 | 11.94 | 22.51 | 8.43 |
| 2023 | 13.59 | 18.89 | 3.99 |
| 2022 | 3.05 | 4.8 | 1.91 |
| 2021 | 3.41 | 4.59 | 2.32 |
| 2020 | 3.26 | 4.15 | 2.58 |
| 2019 | 2.67 | 5.23 | 1.44 |
| 2018 | 7.59 | 16.65 | 2.59 |
| 2017 | 17.03 | 25.68 | 14.68 |
| 2016 | 23.62 | 29.75 | 16.78 |
| 2015 | 13.27 | 28 | 2.67 |
| 2014 | 2.31 | 4.5 | 1.43 |
| 2013 | 1.65 | 1.95 | 1.37 |
| 2012 | 2.02 | 2.57 | 1.49 |
| 2011 | 2.87 | 3.71 | 2.07 |
| 2010 | 3 | 3.91 | 2.31 |
| 2009 | 2.57 | 3.67 | 1.74 |
| 2008 | 2.67 | 4.6 | 1.3 |
| 2007 | 3.46 | 5.5 | 1.5 |
| 2006 | 1.34 | 1.77 | 1.08 |
| 2005 | 1.31 | 1.55 | 0.96 |
| 2004 | 2.01 | 3.54 | 1.06 |