| 年份 | 单位：% |
| 2012 | 购买后可见 » |
| 2011 | 购买后可见 » |
| 2010 | 购买后可见 » |
| 2009 | 购买后可见 » |
| 2008 | 购买后可见 » |
| 2007 | 购买后可见 » |
| 2006 | 购买后可见 » |
| 2005 | 购买后可见 » |
| 2004 | 购买后可见 » |
| 2003 | 购买后可见 » |
| 2002 | 49.20 |
| 2001 | 42.20 |
| 2000 | 55.40 |
| 1999 | 44.70 |
| 1998 | 45.00 |
| 1997 | 43.70 |
| 1996 | 49.40 |
| 1995 | 52.40 |
| 1994 | 66.20 |
| 1993 | 56.20 |
| 1992 | 66.70 |
| 1991 | 64.00 |
| 1990 | 1.20 |
| 1989 | 30.00 |
| 1988 | 76.90 |
| 1987 | 17.00 |
| 1986 | 113.40 |
| 1985 | 40.60 |
| 1984 | 46.50 |
| 1983 | 19.70 |
| 1982 | 44.40 |
| 1981 | 10.20 |
前瞻产业研究院 咨询·服务