| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.75 | 0.94 | 0.56 |
| 2024 | 0.54 | 0.77 | 0.37 |
| 2023 | 0.63 | 0.99 | 0.5 |
| 2022 | 0.55 | 0.68 | 0.34 |
| 2021 | 0.46 | 0.63 | 0.31 |
| 2020 | 0.57 | 0.71 | 0.47 |
| 2019 | 0.51 | 0.7 | 0.38 |
| 2018 | 0.47 | 0.64 | 0.35 |
| 2017 | 0.72 | 0.92 | 0.58 |
| 2016 | 0.79 | 1.1 | 0.53 |
| 2015 | 1 | 1.63 | 0.59 |
| 2014 | 0.55 | 1 | 0.42 |
| 2013 | 0.5 | 0.61 | 0.41 |
| 2012 | 0.51 | 0.7 | 0.4 |
| 2011 | 0.8 | 1.05 | 0.45 |
| 2010 | 0.81 | 1.07 | 0.58 |
| 2009 | 0.58 | 0.89 | 0.29 |
| 2008 | 0.63 | 1.55 | 0.23 |
| 2007 | 1.03 | 1.81 | 0.18 |
| 2006 | 0.17 | 0.2 | 0.14 |
| 2005 | 0.22 | 0.32 | 0.17 |
| 2004 | 0.32 | 0.63 | 0.2 |