Year	constant 2015 US$
1960	69030000
1961	65320000
1962	94250000
1963	59160000
1964	61490000
1965	64090000
1966	90680000
1967	99580000
1968	115950000
1969	123580000
1970	141370000
1971	152230000
1972	160190000
1973	177040000
1974	185370000
1975	308390000
1976	260050000
1977	284380000
1978	325030000
1979	338020000
1980	328940000
1981	363620000
1982	372230000
1983	364900000
1984	415780000
1985	450720000
1986	409680000
1987	405630000
1988	395810000
1989	365000000
1990	408100000
1991	503570000
1992	449970000
1993	476380000
1994	971660000
1995	843510000
1996	572030000
1997	310550000
1998	464900000
1999	492660000
2000	452310000
2001	439040000
2002	490730000
2003	402620000
2004	532630000
2005	602350000
2006	618090000
2007	737610000
2008	850690000
2009	881540000
2010	975000000
2011	1137250000
2012	811360000
2013	987910000
2014	933570000
2015	1072780000
2016	1147440000
2017	1204890000