Year	current US$
1960	109900000
1961	106400000
1962	111900000
1963	122900000
1964	137600000
1965	178100000
1966	178100000
1967	189300000
1968	211800000
1969	244333000
1970	316664000
1971	349799000
1972	373452000
1973	455138000
1974	719569000
1975	693201000
1976	769366000
1977	1021427000
1978	1091694000
1979	1397804000
1980	1470745000
1981	1208875000
1982	893261000
1983	989730000
1984	1091210000
1985	1096692000
1986	1144663000
1987	1384496000
1988	1409851612
1989	1737420900
1990	2026137100
1991	1849740500
1992	2789232000
1993	3146371089
1994	3024345219
1995	3214186598
1996	3561068698
1997	4969652300
1998	6238733436
1999	6354597700
2000	4444396683
2001	6524150044
2002	4962115969
2003	7605799018
2004	8225599070
2005	9766546719
2006	11534342965
2007	12944940071
2008	15372002434
2009	11394622736
2010	13566519201
2011	16144348598
2012	17571484780
2013	18122588183
2014	17162078395
2015	15633533616
2016	15367607270
2017	15920122022
2018	16707591717
2019	16112958169
2020	14456985914