Year	current US$
1980	1380.673732608181
1981	1504.3218644768597
1982	1510.5110340638191
1983	1401.4622842123222
1984	1362.063554335568
1985	1315.0137186893267
1986	1289.7446441768884
1987	1300.8476440485542
1988	1282.647711277998
1989	1285.5445775723558
1990	1691.0147058891916
1991	1629.8919575782836
1992	1756.3911018257356
1993	1716.5093051896622
1994	1698.8651325947385
1995	1837.4224062625333
1996	1940.2998556232847
1997	2067.821118685112
1998	2007.8182146322597
1999	2144.444219969928
2000	2313.9549980605925
2001	2256.714949171218
2002	2241.3733626946128
2003	2377.7093546611068
2004	2730.9270016050095
2005	3183.6980765632566
2006	3720.076480700456
2007	4276.966702966755
2008	5143.976408779818
2009	4583.9907109325795
2010	5190.186468443478
2011	5347.506766477916
2012	5798.682597507872
2013	5843.977197095433
2014	5905.965693758541
2015	5267.248711975829
2016	5191.447111391986
2017	5195.309558320288
2018	5369.8158049212225
2019	5335.080583383592
2020	4775.067701932781