单位:%
                时间范围:1978 - 2023
                数据来源:国家统计局
            | 序号 | 时间(年) | 数据(%) | 
|---|---|---|
| 1 | 2023 | |
| 2 | 2022 | |
| 3 | 2021 | |
| 4 | 2020 | |
| 5 | 2019 | |
| 6 | 2018 | 33.18 | 
| 7 | 2017 | 33.90 | 
| 8 | 2016 | 32.73 | 
| 9 | 2015 | 35.63 | 
| 10 | 2014 | 41.03 | 
| 11 | 2013 | 43.90 | 
| 12 | 2012 | 47.00 | 
| 13 | 2011 | 50.00 | 
| 14 | 2010 | 50.30 | 
| 15 | 2009 | 44.24 | 
| 16 | 2008 | 59.84 | 
| 17 | 2007 | 66.80 | 
| 18 | 2006 | 66.85 | 
| 19 | 2005 | 63.90 | 
| 20 | 2004 | 69.80 | 
| 21 | 2003 | 60.10 | 
| 22 | 2002 | 49.00 | 
| 23 | 2001 | 44.00 | 
| 24 | 2000 | 39.16 | 
| 25 | 1999 | 36.50 | 
| 26 | 1998 | 33.80 | 
| 27 | 1997 | 36.20 | 
| 28 | 1996 | 42.30 | 
| 29 | 1995 | 40.20 | 
| 30 | 1990 | 29.78 | 
| 31 | 1989 | 24.60 | 
| 32 | 1985 | 23.10 | 
| 33 | 1980 | 12.60 | 
| 34 | 1978 | 9.65 | 
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