| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.45 | 0.52 | 0.37 |
| 2024 | 0.4 | 0.47 | 0.34 |
| 2023 | 0.47 | 0.55 | 0.39 |
| 2022 | 0.46 | 0.67 | 0.29 |
| 2021 | 0.61 | 0.82 | 0.46 |
| 2020 | 0.52 | 0.72 | 0.35 |
| 2019 | 0.39 | 0.59 | 0.28 |
| 2018 | 0.84 | 1.27 | 0.44 |
| 2017 | 1.54 | 2.32 | 1.15 |
| 2016 | 2.55 | 3.33 | 1.65 |
| 2015 | 2.83 | 4.97 | 1.76 |
| 2014 | 2.14 | 2.86 | 1.21 |
| 2013 | 1.55 | 2.39 | 0.89 |
| 2012 | 12.05 | 103.95 | 1.14 |
| 2011 | 34.68 | 102.82 | 8.86 |
| 2010 | 7.09 | 9.27 | 4.98 |
| 2009 | 4.22 | 5.96 | 1.87 |
| 2008 | 3.37 | 6.01 | 1.35 |
| 2007 | 5.23 | 8.09 | 2.64 |
| 2006 | 2.02 | 3.07 | 0.84 |
| 2005 | 1.04 | 1.3 | 0.82 |
| 2004 | 1.7 | 2.94 | 1.1 |