Year	current US$
1970	479697821.2243751
1971	565610841.2465236
1972	811671078.813613
1973	612680701.3456606
1974	1117551250.1266415
1975	1297978141.2160833
1976	1579191068.3872592
1977	1529344733.4839816
1978	2042955266.2014914
1979	1828025499.9227557
1980	2726624236.957956
1981	2973081430.3107285
1982	3245190139.645594
1983	3700441566.242738
1984	3383668173.186707
1985	3384579120.3077316
1986	3118548448.2343254
1987	2877645310.84569
1988	3231436450.9655685
1989	2330235765.2010913
1990	3481513883.3049054
1991	3982291666.6666665
1992	4203031245.8349233
1993	3972989197.4561424
1994	2818080000
1995	3214051896.207585
1996	3822095808.3832335
1997	3738560311.2840466
1998	4466980769.230769
1999	3864631782.9457364
2000	4683881096.922754
2001	5119551215.458134
2002	5168381455.876372
2003	5381832960.780329
2004	5627821782.178218
2005	5856379310.344828
2006	7242052785.923754
2007	7874068882.659191
2008	9857974022.263468
2009	12334776386.41312
2010	11933747247.581898
2011	13944801296.100914
2012	10120484078.20849
2013	5362728106.1006775
2014	5775480719.298362
2015	5455547856.078037
2016	4304293056.764292
2017	6651985293.287807
2018	8386259560.183774
2019	9200568500.169758
2020	4087725338.5298204
2021	2498445716.75648