| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.27 | 0.3 | 0.23 |
| 2024 | 0.27 | 0.41 | 0.16 |
| 2023 | 13.8 | 33.8 | 0.36 |
| 2022 | 9.4 | 12.27 | 6.68 |
| 2021 | 6.87 | 11.65 | 3.63 |
| 2020 | 3.05 | 6.07 | 1.33 |
| 2019 | 1.34 | 1.66 | 1.05 |
| 2018 | 1.13 | 1.31 | 0.94 |
| 2017 | 1.61 | 1.94 | 1.23 |
| 2016 | 1.68 | 2.15 | 1.46 |
| 2015 | 2.07 | 4.26 | 1.28 |
| 2014 | 1.18 | 1.53 | 0.95 |
| 2013 | 0.91 | 1.06 | 0.79 |
| 2012 | 1.02 | 1.22 | 0.83 |
| 2011 | 1.66 | 2.04 | 1.09 |
| 2010 | 1.91 | 2.25 | 1.52 |
| 2009 | 1.72 | 2.19 | 1.09 |
| 2008 | 2.29 | 4.05 | 0.83 |
| 2007 | 2.91 | 3.94 | 1.64 |
| 2006 | 1.55 | 1.94 | 1.24 |
| 2005 | 1.11 | 1.36 | 0.71 |
| 2004 | 1.13 | 2.02 | 0.8 |