Year	current US$
1978	16000000
1979	28000000
1980	36000000
1981	27000000
1982	18000000
1983	19000000
1984	22000000
1985	18000000
1986	20000000
1987	21000000
1988	45360000.61
1989	69720001.22
1990	94080001.83
1991	118440002.4
1992	142800000
1993	163100000
1994	176600000
1995	195200000
1996	207300000
1997	231700000
1998	246500000
1999	250300000
2000	267700000
2001	256100000
2002	119550000
2003	180410000
2004	234470000
2005	314010000
2006	356443536.609755
2007	463192097.270433
2008	631436069.113049
2009	766571548.308179
2010	1037765445.69439
2011	1137054505.60572
2012	979205922.333175
2013	887803486.561137
2014	732414557.145982
2015	685001365.914279
2016	769242057.986733
2017	1060484529.95531
2018	1010375535.64433
2019	669932291.414625
2020	521040572.482506
2021	596899083.055417
2022	590412343.39639