| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.89 | 9.04 | 5.97 |
| 2024 | 12.27 | 21.08 | 5.99 |
| 2023 | 23.05 | 43.4 | 0.08 |
| 2022 | 0.07 | 0.09 | 0.03 |
| 2021 | 0.02 | 0.03 | 0.02 |
| 2020 | 0.03 | 0.04 | 0.02 |
| 2019 | 0.03 | 0.04 | 0.02 |
| 2018 | 0.06 | 0.07 | 0.02 |
| 2017 | 3.64 | 13.31 | 0.07 |
| 2016 | 24.11 | 61.59 | 12.33 |
| 2015 | 78.65 | 132.19 | 43.29 |
| 2014 | 19.46 | 79.29 | 12.37 |
| 2013 | 25.36 | 34.57 | 17.44 |
| 2012 | 21.72 | 29.17 | 15.61 |
| 2011 | 25.29 | 31.92 | 18.05 |
| 2010 | 22.73 | 31.7 | 19.14 |
| 2009 | 12.42 | 23.77 | 4.01 |
| 2008 | 11.31 | 29.61 | 2.78 |
| 2007 | 13.76 | 28.88 | 3.34 |
| 2006 | 2.28 | 3.84 | 1.37 |
| 2005 | 0.89 | 1.75 | 0.32 |
| 2004 | 0.87 | 1.52 | 0.54 |