Year	current US$
1970	36905002.5
1971	35690697.141
1972	38513000
1973	50414742.738513
1974	62627598.348
1975	77147921.969487
1976	59179498.5
1977	67612503
1978	81113800
1979	99921601.8
1980	96307501.5
1981	118433716.363215
1982	123358404.8
1983	133198401.6
1984	149590495.5
1985	61431397.2563131
1986	70528740.4193782
1987	61739649.1386355
1988	56433736.1864642
1989	71183466.5846617
1990	75487402.4412193
1991	105667153.585084
1992	78149743
1993	99072339.2
1994	125663553.66654
1995	174552079.230769
1996	227719404.170188
1997	380102120.573964
1998	444830105.437239
1999	444467465.330619
2000	479289551.393021
2001	495106213.668444
2002	488526090.529187
2003	371850328.355947
2004	376969745.172398
2005	615561670.467286
2006	647162748.127845
2007	741795731.710573
2008	844152504.385629
2009	868072698.286253
2010	991998036.178383
2011	1090448146.5552
2012	1165638743.90582
2013	1504242086.36952
2014	1610621296.10814
2015	1718846136.29905
2016	1825239069.55809
2017	1919775406.59107
2018	2062352548.48335
2019	2138149837.28354
2020	1889935536.53808
2021	2255669281.63461