Year	constant 2015 US$
1960	883516000
1961	669046000
1962	849559000
1963	688361000
1964	439721000
1965	532292000
1966	679820000
1967	1304034000
1968	1209154000
1969	1037550000
1970	1102743000
1971	1261833000
1972	625992000
1973	1041841000
1974	1091541000
1975	792978000
1976	1064728000
1977	832698000
1978	1340891000
1979	820980000
1980	1745249000
1981	1901493000
1982	2345482000
1983	2352964000
1984	3338573000
1985	3221607000
1986	5123245000
1987	4574535000
1988	5255448000
1989	5901652000
1990	4469324000
1991	4240732000
1992	4968905000
1993	4505241000
1994	3967735000
1995	2291680000
1996	3087936000
1997	1740336000
1998	3115662000
1999	2543199000
2000	2197796000
2001	2596166000
2002	3421587000
2003	2885554000
2004	2589626000
2005	5254620000
2006	3652009000
2007	3564838000
2008	4041408000
2009	2785321000
2010	2652502000
2011	3595114000
2012	2427173000
2013	2909420000
2014	3372826000
2015	4003370000
2016	5042053000