| 序号 | 时间 (年) |
数据 (%) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | |
| 8 | 2014 | |
| 9 | 2013 | |
| 10 | 2012 | |
| 11 | 2011 | 38.00 |
| 12 | 2010 | 37.90 |
| 13 | 2009 | 37.80 |
| 14 | 2008 | 37.70 |
| 15 | 2007 | 37.30 |
| 16 | 2006 | 37.00 |
| 17 | 2005 | 37.10 |
| 18 | 2000 | 33.60 |
| 19 | 1995 | 27.60 |
| 20 | 1978 | 14.90 |
| 21 | 1949 | 0.20 |
