Year	current US$
1970	524.6728057541901
1971	576.807450311364
1972	629.1807398158313
1973	810.4686242994474
1974	1013.9228528050227
1975	1032.5639029104998
1976	1115.782874014212
1977	1201.8031436412125
1978	1317.796838978086
1979	1493.2438328243577
1980	1744.2499842433253
1981	1984.6552913260034
1982	1774.6513547391514
1983	1475.4797849066774
1984	1445.4687643356551
1985	1398.900006210415
1986	1401.3262357251347
1987	1439.7880715376195
1988	1605.1152063990983
1989	1728.8284427765743
1990	1975.551205077318
1991	2160.717763301111
1992	2344.4048016523907
1993	2704.6294695189586
1994	3110.293263819866
1995	3316.4279589623993
1996	3565.4772863121343
1997	3845.357385316868
1998	3794.6226651112565
1999	3288.9333321954246
2000	3557.460632265816
2001	3424.8822334931583
2002	2979.3830288068293
2003	2961.3202484521703
2004	3349.489304647621
2005	3991.2069681314706
2006	4661.958134965708
2007	5513.909005192777
2008	6338.755402875718
2009	5874.92618822779
2010	7165.061253044741
2011	7919.031479495406
2012	7851.585801809974
2013	8029.8425905513
2014	8106.248438140855
2015	6799.4921206073395
2016	6520.448364160251
2017	7221.904007045808
2018	6892.7948417662
2019	6749.1611253688725
2020	5641.13564669125
2021	6267.90195032882