Year	Years
1800	453.1
1950	261.7
1951	259.2
1952	253.9
1953	249.3
1963	180.9
1964	173.8
1965	167.1
1966	161
1967	155.2
1968	149.7
1969	144.8
1970	140.4
1971	136.4
1972	133
1973	130.2
1974	128
1975	126.3
1976	124.9
1977	123.9
1978	123.1
1979	122.3
1980	121.7
1981	121
1982	119.8
1983	118.1
1984	116.3
1985	113.8
1986	110.8
1987	107.3
1988	103.5
1989	99.4
1990	95.4
1991	91.8
1992	88.5
1993	85.8
1994	83.4
1995	81.3
1996	79.1
1997	77
1998	74.9
1999	72.9
2000	71
2001	69.4
2002	68
2003	67
2004	66.2
2005	65.7
2006	65.3
2007	65
2008	64.5
2009	63.7
2010	62.5
2011	61.1
2012	59.7
2013	58.2