Year	Years
1800	449.3
1950	235.4
1951	233.1
1952	228.1
1953	223.8
1954	218.3
1955	212.7
1965	97.7
1966	94.7
1967	92.1
1968	89.9
1969	88.5
1970	87.9
1971	87.8
1972	88.2
1973	88.9
1974	89.6
1975	90.3
1976	90.7
1977	91.1
1978	91.4
1979	92.1
1980	93
1981	94.2
1982	95.7
1983	97.8
1984	100
1985	102.2
1986	104.4
1987	106.4
1988	108.1
1989	109.4
1990	110.4
1991	110.8
1992	110.7
1993	109.9
1994	108.3
1995	106.1
1996	103.4
1997	100.2
1998	96.7
1999	93.1
2000	89.3
2001	85.4
2002	81.5
2003	77.6
2004	73.9
2005	70.3
2006	67
2007	64
2008	61.4
2009	59
2010	56.7
2011	54.6
2012	52.8
2013	51