Year	current US$
1960	648800000
1961	730800000
1962	696300000
1963	815057000
1964	1056515000
1965	1059288000
1966	1228402000
1967	1257225000
1968	1294396000
1969	1497898000
1970	1849477000
1971	2177344000
1972	2353838000
1973	2786651000
1974	5461007000
1975	6387797000
1976	7037009000
1977	7113822000
1978	7289698000
1979	7985080000
1980	5815325888.91
1981	9243039974.1
1982	8431599037.47
1983	8628400513.62
1984	8738058083.17
1985	7423098987.439999
1986	7178015471.97
1987	7234916063.869999
1988	6402192897.669999
1989	8286554931
1990	7744532698.8
1991	8123473785.829999
1992	8781456702.9
1993	10041782187.630001
1994	8522609918.87
1995	10038917929.4
1996	11966738972
1997	11285556845.1
1998	12369355571.3
1999	12571003643.6
2000	12362178474
2001	12677255790
2002	12931589154
2003	13717663729
2004	15433914036
2005	18532581420
2006	21209818268
2007	22938838860
2008	28612488141
2009	20937127751
2010	20772267290
2011	26641014892
2012	29167294775
2013	29796047368
2014	29763111757
2015	30174562125
2016	27787849040
2017	27860087785
2018	27019977069
2019	25481021478
2020	22980337255