| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.77 | 0.86 | 0.68 |
| 2024 | 0.6 | 0.84 | 0.41 |
| 2023 | 0.63 | 0.8 | 0.47 |
| 2022 | 0.52 | 0.79 | 0.4 |
| 2021 | 0.54 | 0.8 | 0.33 |
| 2020 | 0.38 | 0.49 | 0.3 |
| 2019 | 0.36 | 0.47 | 0.32 |
| 2018 | 0.36 | 0.48 | 0.27 |
| 2017 | 0.32 | 0.35 | 0.28 |
| 2016 | 0.31 | 0.37 | 0.25 |
| 2015 | 0.41 | 0.64 | 0.29 |
| 2014 | 0.3 | 0.36 | 0.25 |
| 2013 | 0.3 | 0.4 | 0.22 |
| 2012 | 0.36 | 0.45 | 0.26 |
| 2011 | 0.78 | 2.1 | 0.33 |
| 2010 | 1.18 | 1.98 | 1.03 |
| 2009 | 0.74 | 1.23 | 0.45 |
| 2008 | 0.75 | 1.4 | 0.35 |
| 2007 | 1.07 | 1.44 | 0.6 |
| 2006 | 0.49 | 0.61 | 0.37 |
| 2005 | 0.35 | 0.5 | 0.2 |
| 2004 | 0.36 | 0.59 | 0.22 |