Year	constant 2015 US$
1960	3671060000
1961	4824640000
1962	4993110000
1963	5157200000
1964	3715100000
1965	4641040000
1966	4738920000
1967	4398710000
1968	4026290000
1969	4403550000
1970	3800470000
1971	3771160000
1972	3823380000
1973	2840370000
1974	1923180000
1975	3367710000
1976	3607340000
1977	3723960000
1978	3517090000
1979	4975840000
1980	4658970000
1981	4348910000
1982	3722030000
1983	3960740000
1984	3259080000
1985	4730310000
1986	4754270000
1987	3144470000
1988	2907930000
1989	2561170000
1990	4392910000
1991	5398580000
1992	4136360000
1993	3296670000
1994	2700950000
1995	1432970000
1996	3933110000
1997	227850000
1998	197410000
1999	162680000
2000	554030000
2001	668560000
2002	658080000
2003	436340000
2004	521500000
2005	824350000
2006	945350000
2007	940750000
2008	1193200000
2009	1430940000
2010	1525580000
2011	3821950000
2012	3308300000
2013	3047210000
2014	3900590000
2015	2509970000
2016	4600810000
2017	3844480000