Year	current US$
1981	202329523.733333
1982	222816173.066667
1983	237128014.933333
1984	181256638.2
1985	188452486.2
1986	314649512.858053
1987	302963575.207986
1988	293705585.525415
1989	364696936.553984
1990	186271738.84
1991	168561668.747369
1992	64535593.1924885
1993	30400302.8221397
1994	36256157.2300834
1995	52738204.6476896
1996	55917116.823212
1997	46757527.1028748
1998	60190164.9766166
1999	53210400.0071707
2000	62589663.3254313
2001	78558434.767508
2002	95773433.5621013
2003	87029663.3248001
2004	81419503.1009552
2005	102739544.368363
2006	141710804.069888
2007	175841745.195321
2008	233605766.049771
2009	189708488.326154
2010	288179287.407007
2011	398317572.271101
2012	732791136.063262
2013	659348249.127346
2014	663664157.01776
2015	509778325.912624
2016	500245993.781665
2017	451712031.997235
2018	546496780.660285
2019	578101755.753972
2020	551501645.879685
2021	597334582.763334