| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.96 | 4.83 | 3.4 |
| 2024 | 2.73 | 4.73 | 1.58 |
| 2023 | 3.76 | 4.85 | 2.88 |
| 2022 | 3.25 | 3.82 | 2.59 |
| 2021 | 4.35 | 6.06 | 3.32 |
| 2020 | 6.1 | 9.84 | 4.48 |
| 2019 | 6.6 | 9.32 | 5.48 |
| 2018 | 8.17 | 15.77 | 4.16 |
| 2017 | 14.75 | 15.87 | 12.37 |
| 2016 | 15.5 | 20.4 | 11.53 |
| 2015 | 22.05 | 41.67 | 10.59 |
| 2014 | 11.19 | 21.88 | 7.02 |
| 2013 | 5.79 | 8.61 | 4.26 |
| 2012 | 5.55 | 7.08 | 4.42 |
| 2011 | 9.71 | 13.29 | 5.02 |
| 2010 | 11.88 | 16.29 | 8.02 |
| 2009 | 10.58 | 15.65 | 7.51 |
| 2008 | 1020.83 | 26313.6 | 6.2 |
| 2007 | 0 | ||
| 2006 | 13.69 | 20.51 | 3.53 |
| 2005 | 21.95 | 36.62 | 4.75 |
| 2004 | 9.37 | 13.87 | 6.44 |