| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.52 | 0.72 | 0.42 |
| 2024 | 0.38 | 0.66 | 0.28 |
| 2023 | 0.44 | 0.57 | 0.37 |
| 2022 | 0.48 | 0.73 | 0.37 |
| 2021 | 0.45 | 0.58 | 0.34 |
| 2020 | 0.57 | 0.69 | 0.47 |
| 2019 | 0.63 | 0.8 | 0.56 |
| 2018 | 0.78 | 0.94 | 0.61 |
| 2017 | 1.17 | 1.59 | 0.89 |
| 2016 | 1.2 | 1.41 | 0.92 |
| 2015 | 1.24 | 2.15 | 0.74 |
| 2014 | 0.64 | 0.9 | 0.55 |
| 2013 | 0.66 | 0.86 | 0.51 |
| 2012 | 0.64 | 0.79 | 0.47 |
| 2011 | 0.81 | 1.11 | 0.5 |
| 2010 | 1.06 | 1.37 | 0.81 |
| 2009 | 0.86 | 1.31 | 0.44 |
| 2008 | 0.55 | 1.06 | 0.25 |
| 2007 | 1.06 | 1.39 | 0.73 |
| 2006 | 0.65 | 0.78 | 0.51 |
| 2005 | 0.52 | 0.61 | 0.42 |
| 2004 | 0.72 | 1.29 | 0.42 |