Year	current US$
1970	19.356822120916316
1971	22.233496966639755
1972	28.34306417369567
1973	35.00026660389285
1974	44.45225686636388
1975	57.15327470877614
1976	70.830065715142
1977	63.4148826380347
1978	78.03596442673677
1979	109.21008295765172
1980	124.41424056980888
1981	106.07840550534361
1982	96.50509836841374
1983	92.85316267819894
1984	75.8574843232352
1985	71.98356827053246
1986	88.319631021005
1987	138.65592505519624
1988	126.51101936660088
1989	112.13633495970534
1990	126.77319648177259
1991	118.08388398318624
1992	146.12531419726608
1993	181.80430250881713
1994	311.79137622751176
1995	253.3358527708509
1996	236.91859528615993
1997	190.86403929701507
1998	191.2510518002691
1999	185.74110750394624
2000	190.37448285057096
2001	213.11960288931272
2002	184.11890940863566
2003	203.15488868974901
2004	217.9634114821373
2005	280.2694371559435
2006	287.3919071015165
2007	300.09729944195834
2008	306.0840181786001
2009	333.5721888345532
2010	387.5204746074163
2011	452.2524970986625
2012	457.7957713640622
2013	445.63229707415786
2014	375.4862210126534
2015	386.36586183731
2016	318.3520012219441
2017	407.8110887224913
2018	420.55177742052786
2019	412.3663827731957
2020	561.617321337779
2021	639.0774090693752