Year	current US$
1960	351700000
1961	341700000
1962	345000000
1963	380500000
1964	429900000
1965	428600000
1966	428800000
1967	423600000
1968	440800000
1969	480820000
1970	481060000
1971	494130000
1972	638410000
1973	911400000
1974	1701170000
1975	1540600000
1976	1261010000
1977	1298430000
1978	1500240000
1979	1930770000
1980	2404630000
1981	2285070000
1982	2067639999.9999998
1983	2049820000.0000002
1984	2168600000
1985	2171540000
1986	2440170000
1987	2945320000
1988	3463759707
1989	3308965419
1990	4585924873
1991	4723993640
1992	4401224566
1993	3799438722
1994	4225807601.0000005
1995	4948686878
1996	5125088156
1997	5127334112
1998	4634222505
1999	8184103337
2000	7187880382
2001	7000469533
2002	7614533765
2003	8488642589.999999
2004	9678295763
2005	10370117598
2006	11813359090
2007	13968108396
2008	18733980757
2009	13390432605
2010	16511494030.000002
2011	20612707441
2012	19506911855
2013	21752881037
2014	23599415798
2015	21140204025
2016	22825661253
2017	24585413745
2018	27642784355
2019	27692162663
2020	25775523942