| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.33 | 0.34 | 0.29 |
| 2024 | 0.3 | 0.34 | 0.27 |
| 2023 | 0.34 | 0.39 | 0.28 |
| 2022 | 0.37 | 0.44 | 0.32 |
| 2021 | 0.45 | 0.5 | 0.39 |
| 2020 | 0.53 | 0.65 | 0.47 |
| 2019 | 0.65 | 0.79 | 0.57 |
| 2018 | 0.83 | 0.97 | 0.65 |
| 2017 | 1.18 | 1.45 | 0.94 |
| 2016 | 1.52 | 1.83 | 1.4 |
| 2015 | 1.57 | 2.15 | 1.17 |
| 2014 | 1.28 | 1.71 | 1 |
| 2013 | 3.31 | 6.02 | 1.38 |
| 2012 | 4225.57 | 13242.4 | 595.79 |
| 2011 | 1074.16 | 1901.45 | 535.17 |
| 2010 | 873.56 | 1923.19 | 373.27 |
| 2009 | 304.84 | 509.84 | 161.37 |
| 2008 | 344.21 | 688.93 | 113.45 |
| 2007 | 736.15 | 1538.41 | 434.78 |
| 2006 | 4.42 | 19.19 | 1.3 |
| 2005 | 0.4 | 1.53 | 0.13 |
| 2004 | 0.43 | 1.15 | 0.17 |