1990 3.80%
1991 9.20%
1992 14.20%
1993 14.00%
1994 13.10%
1995 10.90%
1996 10.00%
1997 9.30%
1998 7.80%
1999 7.60%
2000 8.40%
2001 8.30%
2002 9.10%
2003 10.00%
2004 10.10%
2005 10.40%
2006 11.10%
2007 13.00%
2008 9.00%
2009 9.20%
2010 10.20%
如图
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