| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.34 | 0.44 | 0.3 |
| 2024 | 0.37 | 0.46 | 0.26 |
| 2023 | 0.53 | 0.73 | 0.41 |
| 2022 | 0.65 | 0.86 | 0.53 |
| 2021 | 1.31 | 2.07 | 0.81 |
| 2020 | 1.44 | 1.95 | 0.87 |
| 2019 | 0.6 | 0.84 | 0.42 |
| 2018 | 0.69 | 0.99 | 0.46 |
| 2017 | 0.89 | 1.15 | 0.69 |
| 2016 | 0.65 | 0.87 | 0.58 |
| 2015 | 0.88 | 1.42 | 0.58 |
| 2014 | 0.55 | 0.68 | 0.42 |
| 2013 | 0.49 | 0.54 | 0.44 |
| 2012 | 0.5 | 0.62 | 0.43 |
| 2011 | 0.77 | 1.1 | 0.48 |
| 2010 | 1.35 | 1.96 | 0.96 |
| 2009 | 1.4 | 1.97 | 0.73 |
| 2008 | 1.53 | 2.78 | 0.56 |
| 2007 | 1.33 | 2.43 | 0.67 |
| 2006 | 0.59 | 0.7 | 0.46 |
| 2005 | 0.64 | 0.98 | 0.45 |