Year	current US$
1980	1931.2493458572512
1981	3365.4484502675464
1982	5517.150054373007
1983	5864.206736147856
1984	5297.785298968362
1985	3496.0205595920806
1986	3300.1905358913896
1987	3239.77949330372
1988	4133.123290927407
1989	3720.0478075624214
1990	4726.906594941769
1991	6271.815396594847
1992	5880.375743348513
1993	6080.656611437355
1994	6513.3009403641445
1995	6941.126711586435
1996	6787.126345189757
1997	6718.708161415123
1998	6880.754913421375
1999	6607.0188151262555
2000	8632.094190846085
2001	8533.760594421881
2002	8853.071569453125
2003	9997.89767776251
2004	11008.74471881459
2005	12190.77427244792
2006	13198.271675404667
2007	14975.580277238854
2008	15701.51970956281
2009	13028.644172093082
2010	13918.803269799406
2011	13149.738231022122
2012	17353.238375238358
2013	17460.764877928355
2014	17401.907476240263
2015	17185.11563897824
2016	17895.10227340524
2017	18636.574103275183
2018	18425.341042517783
2019	18774.707463674586
2020	17191.26981441695