| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 0.99 | 1.11 | 0.87 |
| 2025 | 0.75 | 0.87 | 0.59 |
| 2024 | 0.66 | 0.77 | 0.58 |
| 2023 | 0.3 | 0.66 | 0.06 |
| 2022 | 0.63 | 0.78 | 0.56 |
| 2021 | 0.55 | 0.76 | 0.42 |
| 2020 | 0.37 | 0.43 | 0.29 |
| 2019 | 0.3 | 0.39 | 0.24 |
| 2018 | 0.31 | 0.38 | 0.25 |
| 2017 | 0.4 | 0.47 | 0.34 |
| 2016 | 0.41 | 0.48 | 0.37 |
| 2015 | 0.39 | 0.51 | 0.29 |
| 2014 | 0.37 | 0.43 | 0.32 |
| 2013 | 0.44 | 0.55 | 0.36 |
| 2012 | 0.47 | 0.61 | 0.34 |
| 2011 | 0.86 | 1.26 | 0.46 |
| 2010 | 0.79 | 1.15 | 0.55 |
| 2009 | 0.59 | 0.84 | 0.41 |
| 2008 | 0.95 | 1.76 | 0.3 |
| 2007 | 1.6 | 2.34 | 1.01 |
| 2006 | 0.98 | 1.19 | 0.75 |
| 2005 | 0.17 | 0.79 | 0.02 |
| 2004 | 0.04 | 0.06 | 0.03 |