| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.17 | 1.31 | 1.09 |
| 2024 | 1.11 | 1.52 | 0.85 |
| 2023 | 1.14 | 1.72 | 0.91 |
| 2022 | 0.84 | 1.04 | 0.74 |
| 2021 | 0.72 | 0.8 | 0.65 |
| 2020 | 0.81 | 0.91 | 0.71 |
| 2019 | 0.86 | 1.1 | 0.75 |
| 2018 | 0.94 | 1.17 | 0.76 |
| 2017 | 1.39 | 1.79 | 1.09 |
| 2016 | 1.59 | 2.03 | 1.43 |
| 2015 | 2.19 | 3.47 | 1.51 |
| 2014 | 2.26 | 4.2 | 1.58 |
| 2013 | 2 | 2.7 | 1.63 |
| 2012 | 2.87 | 5.23 | 1.74 |
| 2011 | 5.28 | 5.78 | 4.6 |
| 2010 | 0 | ||
| 2009 | 0 | ||
| 2008 | 4285.65 | 12692.1 | 75.35 |
| 2007 | 64.74 | 108.99 | 22.25 |
| 2006 | 7.11 | 26.12 | 1.37 |
| 2005 | 1.45 | 2.14 | 0.83 |
| 2004 | 1.88 | 3.48 | 1.16 |