Year	constant 2015 US$
1960	52758000
1961	64244000
1962	135714000
1963	164526000
1964	224094000
1965	246044000
1966	346786000
1967	345521000
1968	402936000
1969	658193000
1970	609436000
1971	760736000
1972	825465000
1973	981086000
1974	1332309000
1975	1534574000
1976	1545087000
1977	1844160000
1978	1704049000
1979	1890603000
1980	1626951000
1981	1709821000
1982	2108299000
1983	1787220000
1984	1761815000
1985	1950662000
1986	1971536000
1987	2114216000
1988	2138815000
1989	2445603000
1990	2287787000
1991	2276602000
1992	2522682000
1993	2372747000
1994	2357349000
1995	1967936000
1996	2148245000
1997	2086562000
1998	1957934000
1999	2088375000
2000	2517394000
2001	2567824000
2002	2870222000
2003	2797584000
2004	2868407000
2005	3574978000
2006	4078683000
2007	3988260000
2008	4159436000
2009	4461185000
2010	4151985000
2011	4569785000
2012	4415365000
2013	4675209000
2014	5176574000
2015	7089300000
2016	4907504000