| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.46 | 0.54 | 0.41 |
| 2024 | 0.31 | 0.59 | 0.23 |
| 2023 | 0.45 | 0.57 | 0.31 |
| 2022 | 0.48 | 0.63 | 0.34 |
| 2021 | 0.54 | 0.68 | 0.46 |
| 2020 | 0.51 | 0.57 | 0.39 |
| 2019 | 0.52 | 0.56 | 0.47 |
| 2018 | 0.63 | 0.79 | 0.5 |
| 2017 | 0.71 | 0.84 | 0.58 |
| 2016 | 0.81 | 0.99 | 0.69 |
| 2015 | 0.75 | 1.2 | 0.48 |
| 2014 | 0.47 | 0.54 | 0.42 |
| 2013 | 0.59 | 0.74 | 0.48 |
| 2012 | 0.53 | 0.62 | 0.41 |
| 2011 | 0.75 | 1.22 | 0.46 |
| 2010 | 0.87 | 1.08 | 0.68 |
| 2009 | 0.72 | 1.02 | 0.52 |
| 2008 | 0.71 | 1.43 | 0.42 |
| 2007 | 1.54 | 2.69 | 0.74 |
| 2006 | 0.66 | 0.91 | 0.5 |
| 2005 | 0.24 | 0.5 | 0.13 |
| 2004 | 0.22 | 0.33 | 0.14 |