| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.73 | 0.85 | 0.61 |
| 2024 | 0.56 | 0.83 | 0.39 |
| 2023 | 0.63 | 1.1 | 0.4 |
| 2022 | 0.62 | 0.79 | 0.49 |
| 2021 | 0.53 | 0.82 | 0.36 |
| 2020 | 0.3 | 0.42 | 0.24 |
| 2019 | 0.31 | 0.42 | 0.25 |
| 2018 | 0.41 | 0.54 | 0.32 |
| 2017 | 0.48 | 0.64 | 0.4 |
| 2016 | 0.39 | 0.52 | 0.34 |
| 2015 | 0.65 | 0.97 | 0.48 |
| 2014 | 0.41 | 0.69 | 0.3 |
| 2013 | 0.29 | 0.44 | 0.2 |
| 2012 | 0.44 | 0.97 | 0.27 |
| 2011 | 0.54 | 0.7 | 0.31 |
| 2010 | 0.83 | 1.4 | 0.57 |
| 2009 | 0.99 | 1.24 | 0.8 |
| 2008 | 1.19 | 1.96 | 0.62 |
| 2007 | 1.08 | 1.61 | 0.35 |
| 2006 | 0.56 | 0.83 | 0.37 |
| 2005 | 0.34 | 0.42 | 0.22 |
| 2004 | 0.48 | 0.94 | 0.29 |