1978	14.91
1979	18.57
1980	22.23
1981	17.56
1982	19.63
1983	23.98
1984	31.64
1985	43.72
1986	36.98
1987	47.18
1988	64.47
1989	58.35
1990	51.4
1991	71.42
1992	106.67
1993	129.85
1994	136.69
1995	145.27
1996	147.52
1997	158.25
1998	163
1999	183.2
2000	207
2001	234.17
2002	235.1
2003	444.39
2004	509.11
2005	570.49
2006	727.89
2007	888.89
2008	934.5
2009	1379.1
2010	1826.47

数据如上