Year	current US$
1970	1497947.3025837
1971	5733951.78633853
1972	9889998.19397183
1973	18400257.3298267
1974	109423573.789613
1975	101575285.60145
1976	110040055.886957
1977	116593887.002759
1978	115071051.5758
1979	266113950.800595
1980	319920934.181763
1981	243188400.849186
1982	146705366.812933
1983	185816643.371397
1984	184003269.91328
1985	179341516.159224
1986	70987629.8250783
1987	99992786.2279848
1988	72347383.7388144
1989	73226455.4451159
1990	119662012.748777
1991	61449144.995681
1992	66137671.205224
1993	61531166.8334054
1994	48121186.067385
1995	62746610.67746
1996	75306775.8020692
1997	57116798.4379082
1998	17693051.4068096
1999	47403311.0053117
2000	108778601.105221
2001	84659614.6009497
2002	56040086.0282868
2003	62646530.917989
2004	114055798.526851
2005	128942765.263276
2006	149973359.814882
2007	175495227.901288
2008	320807863.204035
2009	150037552.293853
2010	240154743.353702
2011	456073288.588719
2012	449682578.979442
2013	422911801.388085
2014	368445705.919692
2015	151315958.979805
2016	107207779.078469
2017	149194653.829778
2018	229495551.562496
2019	193213041.001769
2020	103161492.199645
2021	242511097.214607