| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.13 | 0.13 | 0.12 |
| 2024 | 0.13 | 0.15 | 0.1 |
| 2023 | 0.16 | 0.21 | 0.13 |
| 2022 | 0.23 | 0.3 | 0.17 |
| 2021 | 0.25 | 0.35 | 0.17 |
| 2020 | 0.27 | 0.34 | 0.22 |
| 2019 | 0.35 | 0.51 | 0.25 |
| 2018 | 0.46 | 0.68 | 0.31 |
| 2017 | 0.97 | 1.34 | 0.6 |
| 2016 | 1.06 | 1.51 | 0.87 |
| 2015 | 1.2 | 2.3 | 0.69 |
| 2014 | 0.6 | 0.7 | 0.42 |
| 2013 | 0.59 | 0.89 | 0.42 |
| 2012 | 0 | ||
| 2011 | 0 | ||
| 2010 | 0 | ||
| 2009 | 0 | ||
| 2008 | 23.21 | 31.93 | 12.37 |
| 2007 | 9.85 | 29.24 | 1.42 |
| 2006 | 1.31 | 1.73 | 0.83 |
| 2005 | 1.09 | 1.41 | 0.79 |
| 2004 | 2.01 | 3.69 | 1.01 |