| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 0.62 | 0.69 | 0.57 |
| 2025 | 0.58 | 0.63 | 0.51 |
| 2024 | 0.43 | 0.61 | 0.29 |
| 2023 | 0.2 | 0.95 | 0.06 |
| 2022 | 0.22 | 0.81 | 0.16 |
| 2021 | 0.18 | 0.26 | 0.13 |
| 2020 | 0.18 | 0.26 | 0.14 |
| 2019 | 0.26 | 0.41 | 0.14 |
| 2018 | 0.45 | 0.56 | 0.39 |
| 2017 | 0.72 | 0.8 | 0.54 |
| 2016 | 0.74 | 0.8 | 0.65 |
| 2015 | 0.75 | 1.09 | 0.5 |
| 2014 | 0.4 | 0.53 | 0.33 |
| 2013 | 0.35 | 0.38 | 0.32 |
| 2012 | 0.33 | 0.4 | 0.26 |
| 2011 | 0.51 | 0.68 | 0.35 |
| 2010 | 0.67 | 0.8 | 0.58 |
| 2009 | 0.51 | 0.79 | 0.4 |
| 2008 | 0.97 | 2.09 | 0.42 |
| 2007 | 1.73 | 2.94 | 0.91 |
| 2006 | 0.76 | 0.92 | 0.6 |
| 2005 | 0.14 | 0.61 | 0.03 |
| 2004 | 0.09 | 0.23 | 0.04 |