| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.41 | 0.51 | 0.36 |
| 2024 | 0.48 | 0.67 | 0.35 |
| 2023 | 0.4 | 0.5 | 0.27 |
| 2022 | 0.25 | 0.36 | 0.19 |
| 2021 | 0.37 | 0.52 | 0.24 |
| 2020 | 0.44 | 0.58 | 0.34 |
| 2019 | 0.44 | 0.58 | 0.26 |
| 2018 | 0.4 | 0.67 | 0.25 |
| 2017 | 0.66 | 0.86 | 0.54 |
| 2016 | 0.53 | 0.77 | 0.38 |
| 2015 | 0.54 | 0.79 | 0.38 |
| 2014 | 0.5 | 0.69 | 0.42 |
| 2013 | 0.56 | 0.76 | 0.48 |
| 2012 | 0.32 | 0.51 | 0.25 |
| 2011 | 0.48 | 0.72 | 0.26 |
| 2010 | 0.82 | 1.05 | 0.6 |
| 2009 | 0.61 | 1.03 | 0.27 |
| 2008 | 0.53 | 1.1 | 0.24 |
| 2007 | 0.87 | 1.37 | 0.34 |
| 2006 | 0.37 | 0.46 | 0.29 |
| 2005 | 0.19 | 0.38 | 0.1 |
| 2004 | 0.33 | 0.5 | 0.18 |