Year	current US$
1965	25227000
1966	21410000
1967	22500000
1968	22510000
1969	21010000
1970	29200000
1971	31920015.2058195
1972	36237163.0281279
1973	66642983.9074407
1974	81791077.9301277
1975	61458203.2794107
1976	26217493.8190651
1977	87490937.7638367
1978	74796198.1868811
1979	69507863.0290971
1980	68388262.377928
1981	49054452.8376801
1982	22661186.8376901
1983	15401337.489558
1984	56600058.3273214
1985	44948488.5764499
1986	24603615.5248125
1987	51831054.3489055
1988	145573286.727402
1989	100312268.510001
1990	137160824.714402
1991	153203034.373257
1992	39949511.735669
1993	56875551.8585009
1994	42796672.1958808
1995	110007112.289944
1996	220537333.986479
1997	142179549.180048
1998	255440895.528303
1999	246425647.540579
2000	242980756.229229
2001	202505202.402404
2002	161474518.622774
2003	122037174.686597
2004	128050843.224175
2005	158645871.485267
2006	133771791.846069
2007	216611430.867936
2008	242775848.999834
2009	149356594.709464
2010	307358138.602841
2011	197429644.13814
2012	223175827.884783
2013	413104344.064299
2014	600619340.098287
2015	681580478.271052
2016	610774217.598916
2017	768401046.225973
2018	766154761.931253
2019	846839844.266183
2020	594498493.623211