Year	Years
1800	486.4
1900	485.3
1930	455
1956	324.5
1957	318.7
1958	313
1959	307.3
1960	301.9
1961	296.7
1962	291.5
1963	286.5
1964	281.2
1965	276.2
1966	271.2
1967	266
1968	260.4
1969	254.9
1970	249.3
1971	243.7
1972	237.9
1973	231.9
1974	225.9
1975	220
1976	214
1977	208.2
1978	202.5
1979	197
1980	191.6
1981	186.4
1982	181.1
1983	176
1984	171.2
1985	166.4
1986	161.8
1987	157.3
1988	153
1989	148.8
1990	144.6
1991	140.5
1992	136.4
1993	132.3
1994	128.1
1995	123.9
1996	119.8
1997	115.8
1998	111.8
1999	108.1
2000	104.4
2001	101
2002	97.8
2003	94.9
2004	92.2
2005	89.7
2006	87.4
2007	85.2
2008	83.1
2009	81
2010	174.4
2011	77
2012	75
2013	72.8