Year	Years
1800	446.7
1950	118.4
1951	117.2
1952	115.8
1953	114.5
1954	113
1955	111.4
1956	109.7
1957	108
1958	106.2
1959	104.4
1960	102.6
1961	100.5
1962	98.3
1963	95.9
1964	93.3
1965	90.4
1966	87.2
1967	83.8
1968	80
1969	75.9
1970	71.8
1971	67.6
1972	63.3
1973	59
1974	54.7
1975	50.2
1976	45.8
1977	41.4
1978	37.4
1979	33.7
1980	30.5
1981	27.7
1982	25.4
1983	23.5
1984	21.9
1985	20.5
1986	19.5
1987	18.6
1988	17.8
1989	17.1
1990	16.5
1991	15.9
1992	15.5
1993	15
1994	14.7
1995	14.5
1996	14.3
1997	14.2
1998	14.2
1999	14.2
2000	14.2
2001	14.3
2002	14.3
2003	14.3
2004	14.3
2005	14.2
2006	14.2
2007	14.2
2008	14.2
2009	14.2
2010	14.3
2011	14.3
2012	14.3
2013	14.2