Year	constant 2015 US$
1971	4557424558.141247
1972	4563656662.434633
1973	4295551975.052323
1974	4767017542.303905
1975	5307226181.266074
1976	4927350391.498279
1977	5036656311.598246
1978	7420710724.796557
1979	7479506908.47891
1980	6354401410.997723
1981	8326962907.118827
1982	10992017773.78699
1983	10910954656.47136
1984	11666425808.01259
1985	12432838233.161875
1986	15454988035.649378
1987	14076082571.571848
1988	12405609740.581383
1989	10150382174.29321
1990	9600269061.962296
1991	9786183525.105108
1992	8390940086.540294
1993	9998757666.888115
1994	9897280446.482672
1995	9985902358.31592
1996	10165695197.005898
1997	11134828248.894012
1998	11940413129.556593
1999	12716273675.978628
2000	12837227327.20637
2001	13385170753.99726
2002	13887735457.723783
2003	15093542483.317924
2004	16531747560.387735
2005	16766599394.8606
2006	17532927860.674477
2007	17857510057.47353
2008	18021075471.241287
2009	19550451254.49846
2010	19774380730.449528
2011	20139946838.12803
2012	21136004305.72103
2013	22984112054.97019
2014	24788674858.868874
2015	26126342417.538
2016	27557223580.223427
2017	28427453365.26953
2018	29802001564.811333
2019	31286656254.100216
2020	32841881683.875725
2021	32489721688.243324