Year	current US$
1960	3300000
1961	100000
1962	1500000
1963	1100000
1964	100000
1965	100000
1967	81100000
1968	91930000
1969	88250000
1971	106030000
1972	176390000
1973	348730000
1974	992220000
1975	1048510000
1976	1332790000
1977	1639740000
1978	1844750000
1979	2653200000
1980	4588580000
1981	4001210000
1982	3785500000
1983	3367240000
1984	3182960000
1985	2934350000
1986	1797530000
1987	1900900872
1988	1706724444
1989	1882403191
1990	2211970637
1991	2465796963
1992	3913409000
1993	3632070000
1994	3290360000
1995	3388260000
1996	3669640000
1997	3972560000
1998	1979926919
1999	2551773160
2000	3479451563
2001	3508038692
2002	3565340950
2003	4426724330
2004	5331020674
2005	6358722449
2006	7632678017
2007	7701459577
2008	10579971281
2009	7176920983
2010	8886907309
2011	12463501281
2012	12980988093
2013	11436175431
2014	10616245502
2015	6353092387
2016	4912482709
2017	5586885585
2018	6572138429
2019	7252924359
2020	6608200615