Year	Years
1800	472.3
1950	156.8
1951	154.2
1952	149.4
1953	145.2
1954	140.2
1955	135.8
1956	131.3
1957	126.7
1958	122
1959	118.2
1960	113.7
1961	109.9
1962	106.2
1963	102.6
1964	99.02
1965	95.49
1966	92.02
1967	89.12
1968	85.86
1969	83.28
1970	80.85
1971	78.05
1972	75.9
1973	73.88
1974	72.33
1984	25.8
1985	25.3
1986	24.8
1987	24.2
1988	23.6
1989	23
1990	22.2
1991	21.4
1992	20.6
1993	19.9
1994	19.1
1995	18.4
1996	17.8
1997	17.2
1998	16.7
1999	16.3
2000	15.9
2001	15.5
2002	15.2
2003	14.9
2004	14.6
2005	14.4
2006	14.1
2007	13.8
2008	13.5
2009	13.2
2010	12.8
2011	12.5
2012	12.2
2013	11.8