| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 0.8 | 1.08 | 0.56 |
| 2023 | 0.99 | 1.42 | 0.69 |
| 2022 | 0.79 | 1.07 | 0.61 |
| 2021 | 1.06 | 1.37 | 0.81 |
| 2020 | 1.47 | 2.04 | 0.95 |
| 2019 | 1.21 | 1.54 | 0.96 |
| 2018 | 1.57 | 2.28 | 0.98 |
| 2017 | 2.06 | 2.76 | 1.59 |
| 2016 | 3 | 5.26 | 0.85 |
| 2015 | 1.06 | 2.35 | 0.51 |
| 2014 | 0.64 | 0.89 | 0.48 |
| 2013 | 0.53 | 0.85 | 0.35 |
| 2012 | 0.45 | 0.56 | 0.3 |
| 2011 | 0.63 | 0.87 | 0.42 |
| 2010 | 0.75 | 1.05 | 0.56 |
| 2009 | 0.7 | 0.82 | 0.45 |
| 2008 | 0.8 | 1.53 | 0.3 |
| 2007 | 0.83 | 1.19 | 0.5 |
| 2006 | 0.53 | 0.81 | 0.4 |
| 2005 | 0.66 | 0.81 | 0.53 |
| 2004 | 0.87 | 1.62 | 0.57 |