Year	current US$
1971	324.2457515483393
1972	335.1073693808771
1973	401.9965875368142
1974	483.9820415008959
1975	543.0418220137866
1976	641.0612078300946
1977	791.7704525652978
1978	856.514689442983
1979	950.8848253239972
1980	1049.026081548214
1981	1116.2954112570337
1982	1094.8339040917913
1983	1104.9054197194243
1984	1117.4426407074702
1985	1121.8792396100714
1986	803.4238962440251
1987	770.0288307359184
1988	830.9557419668607
1989	870.7729104683265
1990	765.5275081508047
1991	933.4380377793898
1992	1004.8727172997097
1993	1072.8247877534097
1994	1189.0848473899932
1995	1307.2442491591153
1996	1355.5880453130615
1997	1497.9833306915546
1998	1599.7279196298553
1999	1464.6984444555505
2000	1496.3297024043466
2001	1401.5026884854944
2002	1495.7695426156356
2003	1536.7994222085931
2004	1631.4013823550863
2005	1802.844577621064
2006	1942.6315570867828
2007	2130.6725723901886
2008	2410.707355129654
2009	2268.3893658262637
2010	2417.946360485935
2011	2722.663061775607
2012	2871.7343020367757
2013	3004.24382352275
2014	3212.699027804777
2015	3439.847119790654
2016	3560.903887189735
2017	3791.6017884099674
2018	3845.2992260700926
2019	4006.9071074862563
2020	3977.5122596977944
2021	4308.913099932366