Year	constant 2015 US$
1960	39710000
1961	76030000
1962	103330000
1963	144960000
1964	272310000
1965	266370000
1966	237320000
1967	221800000
1968	335720000
1969	200280000
1970	238080000
1971	186820000
1972	197140000
1973	145860000
1974	179370000
1975	228590000
1976	223770000
1977	257660000
1978	276020000
1979	339680000
1980	305500000
1981	308480000
1982	280870000
1983	269660000
1984	443310000
1985	277310000
1986	375980000
1987	451100000
1988	581910000
1989	662020000
1990	699300000
1991	750610000
1992	745410000
1993	655200000
1994	569250000
1995	507850000
1996	579410000
1997	434890000
1998	558090000
1999	573830000
2000	597680000
2001	582350000
2002	512430000
2003	609350000
2004	540330000
2005	596630000
2006	721620000
2007	714220000
2008	826520000
2009	731980000
2010	945480000
2011	714200000
2012	1060980000
2013	1014890000
2014	836380000
2015	1038320000
2016	1241270000
2017	1491370000