Year	current US$
1970	531729390.663944
1971	622579217.16588
1972	690075060.544459
1973	823848805.83065
1974	1047509655.0238
1975	1282031406.9374
1976	1259733035.58903
1977	1341886605.59044
1978	1159575901.07886
1979	1166202249.91755
1980	1262607148.96894
1981	1457679694.13855
1982	1488498512.07077
1983	1299790631.74095
1984	1337599605.26374
1985	1202338891.32972
1986	1118646619.36877
1987	1396360097.23246
1988	1366302812.27501
1989	1889201287.52306
1990	2086145099.30116
1991	2580037781.09795
1992	2409371518.54419
1993	2255857072.03211
1994	2700352744.02059
1995	3428769731.58737
1996	3663942296.2836
1997	3882147736.33276
1998	4283653570.63328
1999	4175250933.05305
2000	4227592761.33507
2001	4272038717.20471
2002	4063660441.70847
2003	3965702467.09578
2004	4029297192.05734
2005	3939235727.53512
2006	3898181127.42604
2007	4167267427.57355
2008	4954132145.54139
2009	6118865700.18183
2010	6560841383.27437
2011	7630261741.42768
2012	9544251180.35822
2013	12071215119.5548
2014	13996738179.6285
2015	14810269064.5978
2016	16125126111.4586
2017	18147270202.2168
2018	19788000561.2375
2019	20652580358.1723
2020	18676680959.3498
2021	21149513330.5547