Year	current US$
1970	31.56270251238888
1971	35.25912062779029
1972	35.85104837717344
1973	30.088512396867618
1974	53.815959042353825
1975	58.87936394251351
1976	85.95123196676766
1977	74.58127011709037
1978	115.15328266003787
1979	129.80730486080532
1980	130.58045101859858
1981	156.64211497808967
1982	156.6654032799277
1983	113.63445649411113
1984	117.36641158531391
1985	124.6518826693612
1986	140.56673607083795
1987	142.9196617987537
1988	150.6006251601003
1989	199.93659186698517
1990	260.08548794715983
1991	185.67468582482195
1992	160.33426146113453
1993	154.68230299778384
1994	162.8321796766418
1995	177.64293522600016
1996	170.78917386362502
1997	198.0965197893447
1998	105.14618300702101
1999	85.798018345319
2000	72.9376338246452
2001	89.13070336561876
2002	84.09255190974412
2003	59.391513698227975
2004	103.86899945952624
2005	108.68350774388912
2006	119.09184784026272
2007	164.28079085751995
2008	177.74637790695525
2009	218.16853450874964
2010	191.5506303317314
2011	126.7021260901606
2012	104.11887210234912
2013	120.82370052473189
2014	134.20959771257355
2015	67.34725477697084
2016	63.48958032836332
2017	76.114207330141
2018	116.24515328271582
2019	163.6500953512803
2020	176.77955453727049
2021	217.97853775164612