Year	current US$
1970	25028006.0371692
1971	32317960.6345803
1972	42437477.0498024
1973	66744000.0276805
1974	209371763.14379
1975	231029665.187037
1976	311077905.527164
1977	353655623.3194
1978	389717307.06871
1979	524884621.501439
1980	790096289.609483
1981	882538713.088908
1982	789468998.393143
1983	676291727.995799
1984	709339918.194717
1985	712373529.773065
1986	593382848.439628
1987	647447733.058092
1988	756791424.00897
1989	802266890.272147
1990	894721064.262416
1991	844127238.871827
1992	922421686.018825
1993	868125728.462427
1994	910211086.005363
1995	1054065600.34751
1996	1168956008.50735
1997	1718406580.8708
1998	1881318777.07291
1999	2013461538.46154
2000	2008241758.24176
2001	2049175824.17582
2002	1970879120.87913
2003	2124675669.27907
2004	2949166207.34392
2005	3862362207.27974
2006	8912010334.66983
2007	11674978058.9353
2008	17422292067.5154
2009	14918258120.9321
2010	19603619245.3217
2011	25958527102.6581
2012	29001562856.3746
2013	30881111969.5564
2014	32316710703.2634
2015	26884550047.1012
2016	26039075681.4235
2017	27069573750.6816
2018	30619698440.7706
2019	29506779425.7723
2020	25683717773.444
2021	31984106178.2738