Year	current US$
1970	327.0832558104579
1971	383.09161520924135
1972	388.29079384253134
1973	730.9109331183023
1974	895.5971141494078
1975	1541.4740363567703
1976	2650.0475301898446
1977	2140.4234042288226
1978	1497.37995259382
1979	805.2656392551329
1980	2775.686184949084
1981	3233.2795899489925
1982	3316.0199472589525
1983	2736.8381045938345
1984	2676.4797145035914
1985	2353.589639373332
1986	2409.336890894098
1987	2069.3794837497567
1988	2791.2099358880087
1989	2431.952305897237
1990	2654.456281244878
1991	2855.0745376206714
1992	2543.1048830454693
1993	1597.3066873546495
1994	1763.528077909915
1995	1872.2712742548067
1996	2246.5171274398945
1997	1982.2429075691002
1998	2034.6492295550622
1999	1940.5854450448999
2000	1354.8877711167343
2001	1838.5164889979258
2002	2053.6596257031397
2003	2536.631889994167
2004	2693.43039820968
2005	3109.210448588161
2006	3107.1364667542566
2007	3446.760238232394
2008	4041.812722159186
2009	3836.756815344031
2010	3740.272300140938
2011	4320.651691079769
2012	4147.473479816519
2013	4678.744151988791
2014	5609.233153976475
2015	4605.245500523417
2016	4420.120801578022
2017	4388.434897630808
2018	4688.690415269213
2019	4527.356122692099
2020	4322.472673550862
2021	4505.83502872903