Year	current US$
1970	166.15214696759173
1971	196.02440377058608
1972	213.27879247022435
1973	117.66066383532872
1974	683.0064698034163
1975	999.0359513180689
1976	1373.910119455539
1977	1599.8306404847226
1978	1667.0577029091864
1979	1403.8828788317446
1980	3102.019079965434
1981	4037.6829704683323
1982	4499.673174027019
1983	4189.6865480031975
1984	4528.53156826996
1985	4630.85803607698
1986	3415.541695204677
1987	3040.225860527087
1988	3068.0557914241613
1989	2981.7074554990204
1990	3316.7463220269724
1991	3782.041496885004
1992	3912.4528455062064
1993	3757.9000633725705
1994	3868.5579959210095
1995	4003.4450534087337
1996	4098.296284924714
1997	4368.9923744525
1998	4072.0239558970575
1999	4092.731679423497
2000	4380.929602356145
2001	4712.64740337064
2002	5193.127110510392
2003	5522.110521102155
2004	5966.890848894325
2005	6764.59478765792
2006	8326.426920818043
2007	9378.816424762788
2008	13377.590232223574
2009	9843.836652870266
2010	12379.789313281348
2011	11923.262408338973
2012	12859.287101328186
2013	12617.401593399552
2014	12603.712110808285
2015	12240.889548319352
2016	11524.25384571703
2017	11682.784693016376
2018	13303.373735208253
2019	12834.528683551636
2020	11983.324314548867
2021	12502.122867684806