Year	current US$
1971	278.8775362328376
1972	285.6948281604398
1973	338.2770288898707
1974	459.055433163049
1975	469.48571187645604
1976	527.6057866366735
1977	631.6438637469723
1978	570.1995206922453
1979	394.60327707532036
1980	561.973723282451
1981	601.1161208417149
1982	595.2792397975031
1983	646.5871147912352
1984	717.1612137606412
1985	598.729195952532
1986	661.736770542334
1987	894.1786762552306
1988	509.9360776329925
1989	174.71982741165587
1990	215.01009733411144
1991	240.93322955490606
1992	261.80199289674084
1993	262.8439421625033
1994	669.969931216764
1995	727.605435092603
1996	757.6373332083906
1997	771.8026206447395
1998	821.1853881440278
1999	843.824101946643
2000	880.5614310843937
2001	896.4317931076994
2002	874.1202554864303
2003	881.3239819897043
2004	951.4668234365696
2005	1041.2944351838257
2006	1087.1440066614193
2007	1183.4984175639297
2008	1338.257766084975
2009	1284.524053036307
2010	1319.9604696952747
2011	1438.6531843553487
2012	1510.6828780947192
2013	1539.9986640866712
2014	1675.7319401389443
2015	1774.078982209041
2016	1800.6708075500276
2017	1838.8852557296068
2018	1717.295917654365
2019	1666.9767168286583
2020	1582.2517090324375
2021	1694.9866583193589