Year	current US$
1970	2436.4721160940044
1971	2662.6380595813066
1972	3061.612888136812
1973	3663.403333555908
1974	3986.094411508386
1975	4410.536772423863
1976	4754.42730466367
1977	5328.506906168056
1978	6372.341436401761
1979	7167.38496361703
1980	7808.890875275203
1981	7849.818575831706
1982	7801.042952244851
1983	8013.0662111294805
1984	8395.722187353556
1985	8783.741023874649
1986	10689.756276372213
1987	12336.890113303036
1988	13898.585138729517
1989	14326.046730900218
1990	15893.326414885483
1991	16622.29381089271
1992	17694.385754092586
1993	17590.23491159222
1994	18853.819598542173
1995	20789.468010822136
1996	20853.23404533044
1997	20423.694337571666
1998	20528.56784158101
1999	21393.527657399332
2000	21649.45177121135
2001	21358.764559375002
2002	22121.274369463335
2003	24639.76127950329
2004	27327.167208185336
2005	28585.475691149975
2006	30048.56437080777
2007	32326.18734710654
2008	33445.74435967606
2009	31273.50097259616
2010	32845.735125123145
2011	35243.65239001519
2012	35222.16297809727
2013	35395.14114437627
2014	36065.27174537608
2015	34030.46913769711
2016	34510.02670894941
2017	35939.42965788556
2018	37872.03202353181
2019	38071.2773858291
2020	36747.245342897244
2021	40485.32897586899