Year	Years
1800	445.4
1900	459.8
1930	431.1
1950	407.7
1951	402.9
1952	395.9
1953	388.3
1954	380.5
1955	372.2
1956	363.6
1957	354.7
1958	345.4
1959	336.4
1960	327.4
1961	318.7
1962	310
1963	301.5
1964	293.1
1965	283.8
1966	274.6
1967	264.8
1968	255.4
1969	246.5
1970	239.8
1971	236.7
1972	238.6
1973	244.8
1983	232.3
1984	222.4
1985	213.2
1986	204.3
1987	195.9
1988	187.8
1989	179.8
1990	172.1
1991	164.6
1992	157.5
1993	150.5
1994	143.8
1995	137.2
1996	130.7
1997	124.5
1998	118.4
1999	112.4
2000	106.6
2001	101
2002	95.5
2003	90.1
2004	85
2005	80.2
2006	75.5
2007	71.4
2008	67.7
2009	64.4
2010	61.6
2011	59
2012	56.8
2013	54.6