Year	constant 2015 US$
1960	1010000
1961	2040000
1962	104080000
1963	89520000
1964	412940000
1965	340280000
1966	304290000
1967	316840000
1968	319870000
1969	345330000
1970	258860000
1971	304300000
1972	238930000
1973	353340000
1974	549520000
1975	464490000
1976	390050000
1977	365520000
1978	572050000
1979	731340000
1980	549500000
1981	906040000
1982	676700000
1983	768570000
1984	881110000
1985	703080000
1986	1143160000
1987	1118810000
1988	939940000
1989	1109040000
1990	1118190000
1991	847770000
1992	829500000
1993	650550000
1994	786690000
1995	724210000
1996	670870000
1997	546490000
1998	647980000
1999	697950000
2000	604970000
2001	610600000
2002	609400000
2003	543790000
2004	1133420000
2005	736050000
2006	885800000
2007	807300000
2008	943780000
2009	927690000
2010	863530000
2011	916970000
2012	971080000
2013	902420000
2014	1006010000
2015	884070000
2016	736550000
2017	894980000