Year	current US$
1972	1136032.48536964
1973	1551445.57823129
1974	2344032.09628887
1975	2028799.581097
1976	2169497.73921545
1977	2459636.28298958
1978	2796841.0209454
1979	3991108.54503464
1980	6842299.28127291
1981	7688648.68105792
1982	7407853.36483161
1983	6914481.81578389
1984	6867896.85652755
1985	6338171.46483558
1986	5561945.03435826
1987	5748260.78966787
1988	6507949.02356113
1989	6352102.62087944
1990	8017895.84920208
1991	8303443.71592749
1992	9926572.76132818
1993	11370662.8034312
1994	15319640.5082275
1995	17724378.1345415
1996	19288242.0306612
1997	19846404.4716854
1998	17226509.142096
1999	19124476.1528014
2000	17824055.2551518
2001	18502902.8529768
2002	16084067.6345093
2003	20607510.4864713
2004	24467487.7162057
2005	30121630.0395654
2006	34161240.2658195
2007	38973008.4984318
2008	54756511.4676235
2009	73920569.3382992
2010	84910049.8927398
2011	98410169.1466112
2012	112128025.938112
2013	128199029.50932
2014	131238039.816686
2015	127600523.613024
2016	132861618.960268
2017	143152730.917666
2018	158532254.425653
2019	159294909.058653
2020	156262099.542212
2021	163954212.90893