Year	current US$
1970	307115.466522131
1971	263627.53370059
1972	295893.963324249
1973	505220.714532481
1974	541032.281022644
1975	735957.195414993
1976	629237.243683736
1977	1195300.18182712
1978	1139114.20463483
1979	956434.169865295
1980	1024161.70431885
1981	883179.539250527
1982	1256160.81237072
1983	750054.077244805
1984	679769.581659297
1985	460223.017653377
1986	757433.976566617
1987	715045.261829931
1988	788593.28764807
1989	799298.861440617
1990	987857.5129417
1991	1025957.12106178
1992	1085254.38207102
1993	884020.920022863
1994	1135040.43478261
1995	1828529.82618826
1996	1912847.34251126
1997	1867026.76627887
1998	2022602.12770101
1999	1200262.32171274
2000	1236972.77040574
2001	1766288.30813743
2002	2125005.77367762
2003	3711072.00390045
2004	3397732.05785905
2005	3378442.09665814
2006	3186770.19380647
2007	4875001.47430262
2008	5500921.59916734
2009	5826904.06572422
2010	4956755.20604706
2011	5623452.30241004
2012	6497781.27698523
2013	6690944.84678016
2014	7517608.57088859
2015	8027665.12691906
2016	8391067.99371389
2017	7877414.21486282
2018	4953746.35555736
2019	4907820.03004799
2020	5422935.22190483
2021	5734358.04927047