| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.17 | 1.55 | 0.93 |
| 2023 | 0.94 | 1.18 | 0.56 |
| 2022 | 1 | 1.52 | 0.62 |
| 2021 | 0.57 | 1.07 | 0.35 |
| 2020 | 0.37 | 0.46 | 0.3 |
| 2019 | 0.42 | 0.51 | 0.37 |
| 2018 | 0.55 | 0.78 | 0.39 |
| 2017 | 0.81 | 1.11 | 0.56 |
| 2016 | 1.01 | 1.28 | 0.77 |
| 2015 | 1.04 | 1.61 | 0.7 |
| 2014 | 0.76 | 1.34 | 0.32 |
| 2013 | 0.59 | 0.87 | 0.41 |
| 2012 | 0.75 | 1.09 | 0.42 |
| 2011 | 1.72 | 2.66 | 0.79 |
| 2010 | 1.98 | 3.06 | 1.35 |
| 2009 | 1.64 | 2.52 | 0.7 |
| 2008 | 1.61 | 3.27 | 0.58 |
| 2007 | 1.97 | 3.82 | 0.94 |
| 2006 | 0.78 | 0.99 | 0.66 |
| 2005 | 0.86 | 1.11 | 0.66 |
| 2004 | 1.52 | 3.03 | 1.06 |