Year	constant 2015 US$
1960	5405940000
1961	4720910000
1962	4616190000
1963	6561470000
1964	8122040000
1965	8398890000
1966	7937340000
1967	8539000000
1968	5745290000
1969	5321510000
1970	4615120000
1971	5290150000
1972	3122240000
1973	3465360000
1974	4907890000
1975	5592980000
1976	5927220000
1977	3126190000
1978	3086900000
1979	3258700000
1980	4753750000
1981	4463920000
1982	3830220000
1983	4325140000
1984	4092400000
1985	3868510000
1986	3817880000
1987	2758820000
1988	3022450000
1989	2716300000
1990	1935440000
1991	3499690000
1992	3003210000
1993	1848770000
1994	2587060000
1995	1816910000
1996	2112650000
1997	1970050000
1998	1965130000
1999	1702360000
2000	1695220000
2001	2258350000
2002	2209260000
2003	724120000
2004	847440000
2005	1919220000
2006	1385320000
2007	1202170000
2008	1804600000
2009	2291780000
2010	2543530000
2011	2785500000
2012	1417650000
2013	2209180000
2014	2707490000
2015	3250780000
2016	2678890000
2017	3107680000