| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.65 | 0.72 | 0.56 |
| 2024 | 0.73 | 0.88 | 0.57 |
| 2023 | 0.81 | 0.96 | 0.7 |
| 2022 | 0.66 | 0.89 | 0.45 |
| 2021 | 0.62 | 0.8 | 0.5 |
| 2020 | 0.51 | 0.7 | 0.43 |
| 2019 | 0.45 | 0.6 | 0.31 |
| 2018 | 0.32 | 0.38 | 0.26 |
| 2017 | 0.71 | 1.17 | 0.36 |
| 2016 | 0.98 | 1.19 | 0.91 |
| 2015 | 0.83 | 1.24 | 0.51 |
| 2014 | 0.44 | 0.67 | 0.34 |
| 2013 | 0.38 | 0.44 | 0.33 |
| 2012 | 0.33 | 0.36 | 0.28 |
| 2011 | 0.48 | 0.59 | 0.28 |
| 2010 | 0.74 | 1.19 | 0.5 |
| 2009 | 0.82 | 1.39 | 0.32 |
| 2008 | 0.46 | 0.89 | 0.17 |
| 2007 | 0.59 | 0.91 | 0.29 |
| 2006 | 0.32 | 0.43 | 0.25 |
| 2005 | 0.5 | 0.63 | 0.35 |
| 2004 | 0.6 | 1.16 | 0.32 |