Year	current US$
1977	1208.6700297315267
1978	1368.4859601942098
1979	1696.1287929728858
1980	2041.0353178618984
1981	2295.4357639956015
1982	2551.3318196245023
1983	2826.0785859244766
1984	3246.421354802371
1985	3787.1178890118745
1986	4597.864956067453
1987	5389.6592348568165
1988	6429.528212217093
1989	7152.3689130075445
1990	7558.940635936593
1991	7925.125049618245
1992	8121.12318012502
1993	8591.811728488825
1994	9319.117543115633
1995	9006.327886996913
1996	9729.664332948094
1997	10311.89576501155
1998	10882.47482449103
1999	11318.118351347379
2000	11998.559081365023
2001	11513.675979988386
2002	11632.733841426114
2003	12141.601736222292
2004	12999.34737945404
2005	14319.88399522737
2006	16114.075630733025
2007	18134.266484588374
2008	18708.973354563193
2009	16401.0273315405
2010	15149.723502602901
2011	14774.032181127845
2012	15136.84110919323
2013	14977.071832106463
2014	15451.495244403935
2015	15985.541138697094
2016	16449.059147040683
2017	16803.87023400006
2018	18133.822600895266
2019	18730.004796637448
2020	15224.858589056117
2021	17178.54371605216
2022	19919.72668678832
2023	21560.21532996654