Year	current US$
1970	515675000
1971	626723900
1972	737444596.0125918
1973	904616043.4258143
1974	1030596829.2682928
1975	1181419756.0975611
1976	1253744336.175396
1977	1288640602.4096386
1978	1609444545.4545455
1979	1748332191.780822
1980	1838817777.777778
1981	1855479397.5903616
1982	1878723647.0588236
1983	1945159254.9476135
1984	2035421741.6050086
1985	2468563271.099465
1986	2199231821.4542837
1987	1955547500.9538345
1988	2122420052.7704484
1989	1892192105.6004102
1990	1953274069.1489363
1991	973862017.1966698
1992	1188406351.3513513
1993	1513105135.1351352
1994	5001826351.351352
1995	6537255968.339078
1996	375500000
1997	336400000
1998	361300000
1999	388100000
2000	395600000
2001	403000000
2002	319000000
2003	370000000
2004	395000000
2005	494100000
2006	546296296.2962962
2007	611296296.2962962
2008	829537037.037037
2009	581481481.4814814
2010	609259259.2592592
2011	780000000
2012	823000000
2013	891000000
2014	827100000
2015	916600000
2016	978000000
2017	993800000
2018	1125868857.5
2019	1528000000
2020	762200000