Year	Years
1800	396.8
1900	321.9
1930	239.5
1950	124.2
1951	122.5
1952	119.5
1953	116.4
1954	113.2
1955	109.9
1956	106.5
1957	103
1958	99.45
1959	95.98
1960	92.01
1975	68.1
1976	65.7
1977	63.5
1978	61.4
1979	59.4
1980	57.6
1981	55.8
1982	54.1
1983	52.7
1984	51.3
1985	50.2
1986	49.4
1987	48.7
1988	48.2
1989	47.7
1990	47.3
1991	46.9
1992	46.4
1993	45.8
1994	45
1995	44.1
1996	42.9
1997	41.5
1998	39.7
1999	37.8
2000	35.7
2001	33.5
2002	31.2
2003	28.9
2004	26.7
2005	24.6
2006	22.6
2007	20.8
2008	19.2
2009	17.7
2010	16.4
2011	15.1
2012	14
2013	13.1