Year	current US$
1971	31341245.8686914
1972	24208871.2734238
1973	15984938.4253223
1974	21687920.1772837
1975	79242568.810057
1976	107269048.249034
1977	92273544.7587038
1978	129208754.341254
1979	183461722.745452
1980	244175613.331043
1981	292637161.421674
1982	256530920.178816
1983	188956096.571448
1984	179921312.21166
1985	137115654.712039
1986	183578953.050661
1987	272291324.473265
1988	370588765.378724
1989	332713243.608183
1990	449889841.383263
1991	497337657.889945
1992	468051648.540195
1993	343054738.999985
1994	353344783.487747
1995	521681136.241295
1996	344198297.08957
1997	269116257.077363
1998	206073248.994871
1999	205515479.014886
2000	-204926387.579112
2001	-181561270.798272
2002	59697140.8230405
2003	227497148.309417
2004	138807921.571966
2005	110893874.263661
2006	-82258732.5079186
2007	77931143.2645692
2008	593398086.360542
2009	157720351.869947
2010	491733591.398712
2011	453919620.710026
2012	419550022.369022
2013	826186501.748846
2014	1468706775.31247
2015	1798444370.70294
2016	1539081955.28657
2017	2219951124.13987
2018	2699492708.61704
2019	2725697813.7312
2020	1572123729.17362
2021	2644136069.14634