Year	constant 2015 US$
1960	1289000
1961	35623000
1962	27103000
1963	47820000
1964	72815000
1965	113719000
1966	126954000
1967	147438000
1968	155785000
1969	131552000
1970	91993000
1971	96555000
1972	120546000
1973	213929000
1974	276612000
1975	321265000
1976	196999000
1977	375111000
1978	442841000
1979	333558000
1980	413985000
1981	589980000
1982	642799000
1983	437882000
1984	533746000
1985	735390000
1986	419430000
1987	344895000
1988	497194000
1989	485039000
1990	240761000
1991	417389000
1992	263558000
1993	274089000
1994	411895000
1995	684796000
1996	604540000
1997	647406000
1998	606817000
1999	677265000
2000	689720000
2001	1003350000
2002	773623000
2003	618477000
2004	741891000
2005	1678681000
2006	1553827000
2007	1681644000
2008	1485446000
2009	1006022000
2010	1107805000
2011	952677000
2012	1005270000
2013	1015055000
2014	1051808000
2015	1323510000
2016	1617786000