| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.44 | 0.58 | 0.34 |
| 2024 | 0.37 | 0.72 | 0.17 |
| 2023 | 0.28 | 0.4 | 0.23 |
| 2022 | 0.29 | 0.4 | 0.21 |
| 2021 | 0.32 | 0.41 | 0.26 |
| 2020 | 0.28 | 0.49 | 0.21 |
| 2019 | 0.27 | 0.38 | 0.2 |
| 2018 | 0.37 | 0.53 | 0.21 |
| 2017 | 0.44 | 0.66 | 0.3 |
| 2016 | 0.32 | 0.5 | 0.26 |
| 2015 | 0.51 | 0.91 | 0.27 |
| 2014 | 0.23 | 0.3 | 0.17 |
| 2013 | 0.2 | 0.25 | 0.15 |
| 2012 | 0.15 | 0.2 | 0.11 |
| 2011 | 0.23 | 0.34 | 0.16 |
| 2010 | 0.31 | 0.46 | 0.22 |
| 2009 | 0.32 | 0.49 | 0.17 |
| 2008 | 0.4 | 0.85 | 0.15 |
| 2007 | 0.61 | 0.92 | 0.36 |
| 2006 | 0.24 | 0.43 | 0.16 |
| 2005 | 0.3 | 0.42 | 0.19 |
| 2004 | 0.35 | 0.71 | 0.21 |