| 年份 | 单位：% |
| 2011 | 5.23 |
| 2010 | 6.08 |
| 2009 | 6.17 |
| 2008 | 6.53 |
| 2007 | 7.77 |
| 2006 | 8.00 |
| 2005 | 8.53 |
| 2004 | 8.72 |
| 2003 | 9.28 |
| 2002 | 10.68 |
| 2001 | 10.51 |
| 2000 | 11.11 |
| 1999 | 12.86 |
| 1998 | 14.15 |
| 1997 | 15.77 |
| 1996 | 14.93 |
| 1995 | 14.71 |
| 1994 | 13.86 |
| 1993 | 13.46 |
| 1992 | 13.09 |
| 1991 | 11.75 |
| 1990 | 8.24 |
| 1989 | 5.63 |
| 1988 | 4.06 |
| 1987 | 2.84 |
| 1986 | 1.89 |
| 1985 | 2.34 |
前瞻产业研究院 咨询·服务