| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.17 | 0.18 | 0.16 |
| 2024 | 0.18 | 0.21 | 0.15 |
| 2023 | 0.2 | 0.25 | 0.16 |
| 2022 | 0.25 | 0.34 | 0.19 |
| 2021 | 0.51 | 0.91 | 0.31 |
| 2020 | 0.49 | 0.67 | 0.38 |
| 2019 | 0.44 | 0.64 | 0.36 |
| 2018 | 0.55 | 0.75 | 0.33 |
| 2017 | 0.65 | 0.83 | 0.42 |
| 2016 | 0.54 | 0.83 | 0.39 |
| 2015 | 0.46 | 0.79 | 0.28 |
| 2014 | 0.27 | 0.36 | 0.22 |
| 2013 | 0.33 | 0.42 | 0.27 |
| 2012 | 0.55 | 1.05 | 0.32 |
| 2011 | 37.91 | 125.59 | 0.72 |
| 2010 | 15.24 | 29.45 | 8.23 |
| 2009 | 5.22 | 9.7 | 1.36 |
| 2008 | 2.85 | 6.36 | 1.04 |
| 2007 | 4.46 | 8.15 | 1.48 |
| 2006 | 2.02 | 3.04 | 1.31 |
| 2005 | 2.51 | 4.06 | 1.6 |
| 2004 | 2.89 | 4.32 | 1.93 |