| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.68 | 0.92 | 0.57 |
| 2024 | 0.56 | 0.83 | 0.46 |
| 2023 | 0.62 | 0.72 | 0.54 |
| 2022 | 0.66 | 0.97 | 0.5 |
| 2021 | 0.62 | 0.92 | 0.34 |
| 2020 | 0.4 | 0.57 | 0.3 |
| 2019 | 0.35 | 0.44 | 0.3 |
| 2018 | 0.46 | 0.62 | 0.32 |
| 2017 | 0.68 | 0.75 | 0.6 |
| 2016 | 0.66 | 0.79 | 0.56 |
| 2015 | 0.81 | 1.51 | 0.56 |
| 2014 | 0.48 | 0.66 | 0.4 |
| 2013 | 0.52 | 0.69 | 0.42 |
| 2012 | 0.77 | 1.05 | 0.47 |
| 2011 | 1.21 | 1.5 | 0.84 |
| 2010 | 1.28 | 1.53 | 1.03 |
| 2009 | 0.83 | 1.26 | 0.57 |
| 2008 | 0.77 | 1.22 | 0.49 |
| 2007 | 0.92 | 1.35 | 0.42 |
| 2006 | 0.37 | 0.47 | 0.26 |
| 2005 | 0.31 | 0.43 | 0.23 |
| 2004 | 0.38 | 0.72 | 0.26 |