Year	current US$
1970	1200.2886627160574
1971	1307.0034315739642
1972	1301.0625437284405
1973	1973.9696524015342
1974	2649.723578069741
1975	1893.8464982604858
1976	1785.2441540377793
1977	1943.5263755344433
1978	1944.7410567185711
1979	2222.63735517723
1980	2403.279925347111
1981	2390.9025065830187
1982	2471.022701871682
1983	3021.023764202768
1984	2263.2992647870387
1985	2488.7196976888386
1986	3174.770525194861
1987	3107.43495925876
1988	3489.448243843038
1989	1927.8939457601507
1990	3696.212873435768
1991	5041.371058158847
1992	6077.90556056918
1993	6198.749862726275
1994	6584.951345661894
1995	6396.374263979767
1996	6696.473890831883
1997	7074.4042529882545
1998	7112.761604335003
1999	6548.740038495125
2000	6430.933315675388
2001	6002.289047230835
2002	1995.2588660437364
2003	2702.5435103339596
2004	3206.862879119148
2005	3812.038219227724
2006	4894.931747446067
2007	6111.114655758181
2008	7573.70820060484
2009	6837.529858200028
2010	8670.414346047692
2011	10725.162544547422
2012	10884.703997004812
2013	10909.098203046684
2014	10265.67065753339
2015	11761.781230478342
2016	10865.789888449119
2017	12578.146137070311
2018	9879.584609644962
2019	8244.068678426163
2020	7211.541025675785
2021	8993.547410487783