| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.96 | 1.29 | 0.79 |
| 2024 | 0.87 | 1.13 | 0.63 |
| 2023 | 1.02 | 1.28 | 0.89 |
| 2022 | 1.03 | 1.44 | 0.82 |
| 2021 | 1.24 | 1.46 | 0.96 |
| 2020 | 1.62 | 2.08 | 1.33 |
| 2019 | 1.27 | 1.61 | 0.97 |
| 2018 | 1.34 | 2.09 | 1.01 |
| 2017 | 2.17 | 2.89 | 1.4 |
| 2016 | 3.77 | 5.56 | 2.55 |
| 2015 | 4.22 | 8.22 | 1.36 |
| 2014 | 145.59 | 725.99 | 1.03 |
| 2013 | 56.8 | 596.08 | 8.97 |
| 2012 | 6.97 | 9.62 | 5.32 |
| 2011 | 10.1 | 16.5 | 5.51 |
| 2010 | 936.27 | 2446.85 | 14.32 |
| 2009 | 75.35 | 146.41 | 10.34 |
| 2008 | 27.21 | 114.22 | 6.34 |
| 2007 | 6844.32 | 9287.61 | 4600.58 |
| 2006 | 25.99 | 39.49 | 23.22 |
| 2005 | 43.06 | 140.97 | 14.41 |
| 2004 | 259.74 | 352.52 | 141.62 |