Year	current US$
1970	45332642.6555834
1971	46214553.4083218
1972	134361523.400497
1973	161523929.061595
1974	275163476.900831
1975	328393240.480501
1976	382967792.024609
1977	227429001.366095
1978	244725038.394404
1979	589094639.913734
1980	569848311.486594
1981	965991392.456308
1982	868712225.778048
1983	746302926.047015
1984	679786406.411776
1985	836658508.622695
1986	956200165.11115
1987	1249934627.66312
1988	1029314553.70095
1989	966895692.440087
1990	943921400.201936
1991	910677338.287583
1992	814186090.779624
1993	679191179.988289
1994	602221804.61599
1995	470168444.222112
1996	629277518.75938
1997	860813056.809844
1998	643459473.73687
1999	282403951.975987
2000	201821922.761381
2001	336920897.999999
2002	469494344.159997
2003	615714754.009994
2004	785386801.839991
2005	1004196564.13999
2006	1259284308.79998
2007	1503482029.20002
2008	2013698458.20002
2009	2210818511.00001
2010	2660483912.4
2011	3122713720
2012	3402885763.2
2013	3721851412.46768
2014	4023195872.19227
2015	3959622270.98214
2016	4023877861.73551
2017	4225585493.87666
2018	4385266431.64902
2019	4444917363.27654
2020	4004955082.02872
2021	3788159766.10149