Year	Years
1800	381.4
1931	285.5
1972	152.7
1973	147.5
1974	142.8
1975	138.6
1976	135.2
1977	132.7
1978	131
1979	130.2
1980	129.7
1981	129.5
1982	128.9
1983	127.3
1984	125
1985	121.6
1986	117.5
1987	113.2
1988	109.6
1989	107.8
1990	108.2
1991	110.9
1992	115.5
1993	119.6
1994	121.2
1995	119.7
1996	116.2
1997	111.5
1998	105.9
1999	99.9
2000	93.5
2001	87.1
2002	80.8
2003	74.9
2004	69.8
2005	65.4
2006	61.8
2007	58.9
2008	56.6
2009	54.5
2010	52.7
2011	51
2012	49.3
2013	47.7