Year	constant 2015 US$
1960	432152000
1961	418665000
1962	299576000
1963	459638000
1964	538681000
1965	643570000
1966	1223718000
1967	1184242000
1968	1132968000
1969	1197485000
1970	1740274000
1971	1857467000
1972	2067189000
1973	2092320000
1974	2468676000
1975	2851376000
1976	2544151000
1977	2873308000
1978	3091156000
1979	2874031000
1980	2655131000
1981	2716737000
1982	2585351000
1983	2917583000
1984	3366498000
1985	3449364000
1986	3538052000
1987	3585170000
1988	3962731000
1989	3598875000
1990	3650677000
1991	3666024000
1992	3679953000
1993	3698827000
1994	3617829000
1995	3265857000
1996	2770966000
1997	3168358000
1998	2837838000
1999	2788000000
2000	2729693000
2001	2461065000
2002	3222778000
2003	2820115000
2004	3247917000
2005	4238083000
2006	3790999000
2007	3849273000
2008	4353754000
2009	3944619000
2010	4512826000
2011	4393470000
2012	4538773000
2013	4034643000
2014	3643954000
2015	4277230000
2016	4056207000