Year	current US$
1970	1110681895.92578
1971	1268830706.35639
1972	1583632961.23179
1973	2318406905.40261
1974	2818262713.91066
1975	3520709776.24219
1976	3813207946.70846
1977	4597055002.81373
1978	5509981544.76754
1979	6184182636.21354
1980	6725598299.07576
1981	5767900434.59366
1982	4956389094.11972
1983	4515955528.20513
1984	4076996150.51662
1985	4404976684.55738
1986	5892961106.19468
1987	6907470091.84223
1988	7013527336.25891
1989	7075198473.58721
1990	8857161281.9894
1991	9115031699.94092
1992	12293491668.012
1993	12108258067.8638
1994	13296798348.2035
1995	8536162698.4127
1996	8570853420.19545
1997	7862776802.856
1998	8043499074.09357
1999	10287591114.8142
2000	11533684445.5697
2001	13515157496.9782
2002	15004444516.3593
2003	18036910321.9124
2004	21037989818.2688
2005	21869875836.5933
2006	23315583549.4999
2007	26881716795.685
2008	31529695109.8216
2009	30765055857.5122
2010	29817411823.2901
2011	32079058051.6332
2012	31041934354.2395
2013	32662951396.7931
2014	33582442568.2022
2015	28324678486.4744
2016	29051556627.144
2017	30647557170.5377
2018	32780707843.6024
2019	32152596887.2891
2020	31531903897.2352
2021	35634451540.2774