| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.62 | 0.69 | 0.58 |
| 2024 | 0.67 | 0.81 | 0.55 |
| 2023 | 1.13 | 1.46 | 0.75 |
| 2022 | 1.13 | 1.4 | 0.95 |
| 2021 | 1.01 | 1.17 | 0.83 |
| 2020 | 0.62 | 0.98 | 0.41 |
| 2019 | 0.61 | 0.82 | 0.53 |
| 2018 | 0.71 | 1.04 | 0.47 |
| 2017 | 0.72 | 1 | 0.61 |
| 2016 | 0.62 | 0.76 | 0.51 |
| 2015 | 0.8 | 1.43 | 0.42 |
| 2014 | 0.28 | 0.55 | 0.22 |
| 2013 | 0.31 | 0.41 | 0.25 |
| 2012 | 0.44 | 0.6 | 0.32 |
| 2011 | 0.92 | 1.36 | 0.5 |
| 2010 | 1.05 | 1.58 | 0.8 |
| 2009 | 0.69 | 0.94 | 0.38 |
| 2008 | 0.84 | 2.33 | 0.32 |
| 2007 | 1.2 | 2.45 | 0.42 |
| 2006 | 0.31 | 0.4 | 0.24 |
| 2005 | 0.34 | 0.48 | 0.23 |
| 2004 | 0.49 | 1.15 | 0.37 |