Year	current US$
1970	61000000
1971	80000000
1972	61000000
1973	53000000
1974	77000000
1975	102000000
1976	128000000
1977	125000000
1978	157000000
1979	222000000
1980	368000000
1981	410000000
1982	388000000
1983	514000000
1984	509000000
1985	917000000
1986	585000000
1987	497000000
1988	521000000
1989	464000000
1990	678000000
1991	613000000
1992	839000000
1993	1108000000
1994	1132000000
1995	775000000
1996	424000000
1997	526000000
1998	506479994.5633858
1999	685479987.2059375
2000	769720005.445182
2001	689869997.2610922
2002	1399369982.0693588
2003	3388259946.579118
2004	2225989980.8168426
2005	2888279968.0158496
2006	3604150005.185977
2007	3182870040.712879
2008	4883719964.684918
2009	5388350006.977095
2010	5082859944.9079485
2011	6654890080.869202
2012	6036510034.782814
2013	6906170002.743605
2014	6292020079.530776
2015	6096589876.336979
2016	6838599972.963335
2017	7804229981.480168
2018	7528180032.949899
2019	6640289949.189872