Year	current US$
1970	2120.3078197066748
1971	2319.126316900772
1972	2664.3459525776007
1973	3189.8647054924418
1974	3490.203390021633
1975	3855.1919843841074
1976	4163.522889783075
1977	4664.953204517782
1978	5564.780400490744
1979	6246.608346126795
1980	6845.354405476043
1981	6905.8044851784525
1982	6844.923824490487
1983	6990.050506814898
1984	7292.272941991014
1985	7603.163312221934
1986	9199.50670639895
1987	10589.74801637049
1988	11906.236213033168
1989	12267.30462286141
1990	13602.653999775717
1991	14236.354607218964
1992	15167.518850486325
1993	15070.481293181134
1994	16122.786622743002
1995	17775.061198644944
1996	17903.165895864273
1997	17579.496815287024
1998	17602.306261089267
1999	18292.609502839023
2000	18575.356367327877
2001	18377.50409096301
2002	19047.795160814963
2003	21248.99931420831
2004	23683.395018456675
2005	24968.096536930803
2006	26440.71991424911
2007	28696.331064497706
2008	30029.783393269405
2009	27721.973769104552
2010	29334.45836298006
2011	31793.01519907791
2012	31886.18799599681
2013	32129.759512019726
2014	32592.716105068295
2015	30325.09831018893
2016	30656.685931849905
2017	32100.558555427164
2018	33870.87999032175
2019	34003.77999611579
2020	32674.86604026411
2021	36069.95383950786