| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.25 | 0.27 | 0.22 |
| 2024 | 0.35 | 0.47 | 0.23 |
| 2023 | 0.55 | 0.71 | 0.44 |
| 2022 | 0.51 | 0.7 | 0.41 |
| 2021 | 0.73 | 1.3 | 0.38 |
| 2020 | 1.61 | 2.44 | 1 |
| 2019 | 2.38 | 4.36 | 1.43 |
| 2018 | 4.59 | 8.27 | 2.25 |
| 2017 | 5.6 | 12.74 | 2.19 |
| 2016 | 14.98 | 43.55 | 9.51 |
| 2015 | 15.41 | 57.99 | 1.63 |
| 2014 | 1.34 | 2.19 | 0.9 |
| 2013 | 2.66 | 6.21 | 1.07 |
| 2012 | 4.58 | 6.25 | 2.83 |
| 2011 | 5.68 | 8.3 | 3.06 |
| 2010 | 5.94 | 9.31 | 3.37 |
| 2009 | 8.5 | 11.84 | 6.89 |
| 2008 | 0 | ||
| 2007 | 0 | ||
| 2006 | 2.35 | 2.74 | 2.08 |
| 2005 | 2.06 | 4.09 | 0.84 |
| 2004 | 1.62 | 2.66 | 1.09 |