| 年份 | 单位：亿元 |
| 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 | -339.51 |
| 2001 | -307.28 |
| 2000 | -95.54 |
| 1999 | -72.09 |
| 1998 | -107.87 |
| 1997 | -29.32 |
| 1996 | -70.53 |
| 1995 | -73.92 |
| 1994 | -106.50 |
| 1993 | -94.11 |
| 1992 | -37.59 |
| 1991 | -55.16 |
| 1990 | -65.71 |
| 1989 | -93.37 |
| 1988 | -61.48 |
| 1987 | -48.38 |
| 1986 | -41.45 |
| 1985 | -42.06 |
| 1984 | -17.91 |
| 1983 | -13.27 |
| 1982 | -17.41 |
| 1981 | -10.90 |
| 1980 | -5.09 |
| 1979 | -6.04 |
| 1978 | -2.12 |
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