Year	current US$
1970	5.825651225801207
1971	5.800217250878972
1972	6.754957104965588
1973	16.26322515445148
1974	28.170369646905055
1975	40.22607227278426
1976	40.353424563052705
1977	46.043924815536464
1978	43.900128892289885
1979	49.64249254839208
1980	55.29058689748561
1981	51.27486069248366
1982	41.88256264713728
1983	35.15199976050838
1984	31.71993847754422
1985	34.34142588233843
1986	31.69483130618878
1987	32.63415936274343
1988	24.829814006388723
1989	23.415842115824287
1990	56.49151092787636
1991	49.96359435365828
1992	35.081945672320295
1993	30.187133708206282
1994	30.734643339275106
1995	23.53409322197839
1996	24.20240044524194
1997	21.92912317003526
1998	23.577466958927268
1999	19.57847942620837
2000	17.62671391572789
2001	18.595470335060174
2002	17.618104544837717
2003	29.556670969283488
2004	37.18938267160079
2005	91.38911213166563
2006	53.42874042550977
2007	56.4793191478659
2008	65.51126935317339
2009	40.247736671766624
2010	33.80097456664116
2011	36.67396475989834
2012	39.749578447101904
2013	57.817361160124484
2014	55.96553787484981
2015	50.98821247150865
2016	66.8726667314977
2017	70.81727496907853
2018	78.47268421377933
2019	68.1643918353175
2020	73.03880894819892
2021	87.92517769826244