| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.06 | 1.38 | 0.87 |
| 2023 | 1.26 | 1.74 | 0.98 |
| 2022 | 1.04 | 1.47 | 0.84 |
| 2021 | 1.44 | 1.78 | 1.22 |
| 2020 | 1.92 | 2.79 | 1.4 |
| 2019 | 1.47 | 1.94 | 0.87 |
| 2018 | 0.97 | 1.52 | 0.46 |
| 2017 | 0.92 | 1.58 | 0.59 |
| 2016 | 0.63 | 0.79 | 0.54 |
| 2015 | 0.94 | 1.42 | 0.69 |
| 2014 | 0.63 | 0.83 | 0.53 |
| 2013 | 0.57 | 0.79 | 0.37 |
| 2012 | 0.51 | 0.76 | 0.3 |
| 2011 | 1.01 | 1.53 | 0.69 |
| 2010 | 1.23 | 1.58 | 0.86 |
| 2009 | 1.16 | 1.45 | 0.84 |
| 2008 | 1.44 | 2.5 | 0.54 |
| 2007 | 1.91 | 2.4 | 1.5 |
| 2006 | 1.32 | 1.88 | 1.08 |
| 2005 | 0.92 | 1.28 | 0.62 |
| 2004 | 0.8 | 1.13 | 0.6 |