Year	current US$
1981	301.8220918885137
1982	290.9660940103231
1983	282.54626478260826
1984	281.6507955326398
1985	286.7966459832607
1986	322.22274799509574
1987	343.6486866291092
1988	340.5338462806503
1989	310.71217766221696
1990	323.53150304433524
1991	324.70115219114575
1992	303.8757952148631
1993	297.2384642206176
1994	234.9004658861403
1995	263.1508170583357
1996	281.4154764760496
1997	284.1896685959173
1998	299.1217185489661
1999	302.46481314486306
2000	315.638802939228
2001	291.30465305828557
2002	300.6369444573387
2003	322.9192516825775
2004	362.08261934231535
2005	397.7177251728053
2006	451.04225947038873
2007	514.2734572774635
2008	605.87022613459
2009	618.3527476135192
2010	639.7054737529145
2011	689.2374010431963
2012	703.0309898272479
2013	770.0101926239037
2014	826.5124000179825
2015	790.9032646776914
2016	812.2528706494207
2017	871.7152880014177
2018	810.614071219917
2019	822.7572120419167
2020	806.7436473811324
2021	834.0898470260413