| 序号 | 时间 (年) |
数据 (%) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | 1.89 |
| 8 | 2014 | 1.91 |
| 9 | 2013 | 2.12 |
| 10 | 2012 | 2.32 |
| 11 | 2011 | 2.56 |
| 12 | 2010 | 2.34 |
| 13 | 2009 | 2.35 |
| 14 | 2008 | 2.54 |
| 15 | 2007 | 2.78 |
| 16 | 2006 | 3.18 |
