| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.13 | 0.16 | 0.11 |
| 2024 | 0.11 | 0.17 | 0.08 |
| 2023 | 0.17 | 0.28 | 0.11 |
| 2022 | 0.23 | 0.34 | 0.16 |
| 2021 | 0.2 | 0.3 | 0.14 |
| 2020 | 0.34 | 0.5 | 0.29 |
| 2019 | 0.37 | 0.49 | 0.22 |
| 2018 | 0.35 | 0.5 | 0.19 |
| 2017 | 0.65 | 0.86 | 0.48 |
| 2016 | 0.84 | 1.08 | 0.71 |
| 2015 | 1.02 | 2.01 | 0.55 |
| 2014 | 0.49 | 0.77 | 0.37 |
| 2013 | 0.39 | 0.5 | 0.31 |
| 2012 | 0.36 | 0.44 | 0.3 |
| 2011 | 0.62 | 0.87 | 0.33 |
| 2010 | 1.14 | 1.73 | 0.78 |
| 2009 | 0.77 | 1.06 | 0.38 |
| 2008 | 0.64 | 1.11 | 0.3 |
| 2007 | 0.93 | 1.4 | 0.46 |
| 2006 | 0.38 | 0.49 | 0.24 |
| 2005 | 0.33 | 0.75 | 0.21 |
| 2004 | 1.08 | 1.78 | 0.68 |