Year	current US$
1980	1256.5228058375353
1981	1209.9357479485427
1982	1056.0967547341957
1983	1092.8862203708484
1984	1188.111840742094
1985	1138.0253702662083
1986	1249.6257330157543
1987	1486.5658175366825
1988	1660.3913801899816
1989	1868.1923313412406
1990	2759.061387331482
1991	2935.6279542575535
1992	3326.4120688200464
1993	3521.8969881492144
1994	3554.3393105456566
1995	3684.535218218657
1996	3727.139977143185
1997	3690.841599197948
1998	3731.6823547110002
1999	3772.5840280908424
2000	3737.162308978857
2001	3720.643534773023
2002	3835.348467041303
2003	3846.1561706779976
2004	3917.6238980355934
2005	4018.3763768241465
2006	4117.987511439065
2007	4151.841766333415
2008	3966.36682907142
2009	4049.799561066776
2010	3887.5617897315483
2011	4021.237395232507
2012	4175.999756922943
2013	4459.987138778924
2014	4621.495522987299
2015	4912.612729333511
2016	4869.348188697051
2017	4772.055405085977
2018	4660.242628210257
2019	4787.397529576864
2020	4181.931579448649
2021	4823.481794172401