Year	current US$
1970	7893453.19349107
1971	10342822.9561531
1972	12740829.2443578
1973	25542520.4091619
1974	161123302.892226
1975	141910270.737304
1976	165215423.196532
1977	176066508.1263
1978	359038251.490305
1979	1221972389.62585
1980	1566111305.87118
1981	1204634074.79575
1982	752057383.960904
1983	910086503.444832
1984	996313883.355266
1985	980299212.124252
1986	406383493.546495
1987	587891668.008254
1988	329671554.697793
1989	449282615.937602
1990	615595227.134074
1991	287788043.222164
1992	315899564.020208
1993	337863762.206794
1994	329018439.219316
1995	359803040.599945
1996	454855215.156593
1997	390025638.514048
1998	191083017.825687
1999	300748639.217098
2000	500065095.771617
2001	344849656.873615
2002	349853702.021111
2003	404783357.36593
2004	391125342.566233
2005	551173966.75111
2006	695554086.476091
2007	731585626.44947
2008	1008642354.66968
2009	467586320.923301
2010	657014447.263002
2011	1308343268.54535
2012	1199262069.33085
2013	1100800790.68574
2014	1133154634.92758
2015	456025570.508938
2016	211522040.300748
2017	317180510.99049
2018	680841446.507212
2019	721335597.435214
2020	308792527.827546
2021	611874545.301287