Year	current US$
1980	263.0198405637486
1981	234.68966132428798
1982	224.775937144467
1983	198.0287269803805
1984	175.16198725173373
1985	180.70687490384546
1986	230.46558806793928
1987	259.4419617795835
1988	278.54036773771196
1989	271.09361094726904
1990	313.13367979088
1991	308.73081299118405
1992	322.15377303041964
1993	298.98850446242943
1994	170.69910021445796
1995	210.65654751153525
1996	225.04013662250625
1997	206.30170726487248
1998	228.81293104131817
1999	269.1878944748566
2000	233.75457501545836
2001	243.01375538351596
2002	265.29239578969776
2003	336.3490835808683
2004	373.4293285978743
2005	406.49021413423793
2006	419.95028927404417
2007	474.6291235860205
2008	566.8196937528371
2009	538.9361170096419
2010	538.3932838289436
2011	602.8918517550962
2012	631.1646560964026
2013	658.7496037490968
2014	656.082792655148
2015	544.8716655694815
2016	576.2285200420347
2017	615.0970087113045
2018	678.9177715695594
2019	653.2212124632064
2020	682.5431243859787
2021	666.8583775437484