Year	current US$
1976	680815538.895078
1977	785450952.634567
1978	962538672.184404
1979	1134100910.27119
1980	1050850641.91362
1981	1040623701.19387
1982	981568277.673889
1983	999869460.909055
1984	955439944.992283
1985	988847542.423727
1986	1355253969.75865
1987	1779190190.79227
1988	2011265985.84487
1989	2068577111.55748
1990	2505982649.91846
1991	2710689634.67258
1992	3029483636.47899
1993	3026497906.34794
1994	3225813859.74399
1995	3610077150.27925
1996	3905340963.38442
1997	3664933689.40419
1998	3637081593.68535
1999	3809663242.1235
2000	4117261713.52852
2001	4129837354.84896
2002	4365883092.67138
2003	5222429255.33459
2004	5938324022.45811
2005	5836081231.32839
2006	6378163207.67506
2007	7555110290.67945
2008	9018186331.73503
2009	7886105694.19339
2010	8593924451.65562
2011	9719565013.99713
2012	9755570175.00937
2013	10454815708.8533
2014	11148021295.3926
2015	10348987079.2442
2016	10867266234.3024
2017	12107670968.1168
2018	13109513305.9314
2019	12993485280.5746
2020	10247727911.709
2021	10343032086.9128