| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.13 | 0.31 | 0.05 |
| 2024 | 0.14 | 0.17 | 0.1 |
| 2023 | 0.19 | 0.24 | 0.15 |
| 2022 | 0.22 | 0.26 | 0.19 |
| 2021 | 0.34 | 0.54 | 0.24 |
| 2020 | 0.26 | 0.34 | 0.22 |
| 2019 | 0.33 | 0.43 | 0.26 |
| 2018 | 0.55 | 0.79 | 0.34 |
| 2017 | 0.72 | 1.06 | 0.61 |
| 2016 | 0.5 | 0.62 | 0.4 |
| 2015 | 0.4 | 0.56 | 0.3 |
| 2014 | 0.3 | 0.38 | 0.28 |
| 2013 | 0.31 | 0.33 | 0.28 |
| 2012 | 0.31 | 0.4 | 0.24 |
| 2011 | 0.51 | 0.7 | 0.32 |
| 2010 | 0.69 | 0.84 | 0.59 |
| 2009 | 0.62 | 0.84 | 0.35 |
| 2008 | 0.67 | 1.12 | 0.28 |
| 2007 | 0.92 | 1.25 | 0.52 |
| 2006 | 0.54 | 0.75 | 0.4 |
| 2005 | 0.3 | 0.54 | 0.17 |
| 2004 | 0.25 | 0.5 | 0.16 |