Year	current US$
1970	1157.2490448884773
1971	1290.7824177730788
1972	1530.244723057133
1973	1924.4473509854938
1974	2136.102121210536
1975	2468.6293637284853
1976	2544.1085780465564
1977	2848.1466797048597
1978	3457.439222676644
1979	4181.706376132824
1980	4669.812179444392
1981	4080.5493998443853
1982	3884.3738563236
1983	3746.38148165606
1984	3581.6414083498225
1985	3686.2959605887945
1986	5042.19992656002
1987	6189.249452686852
1988	6862.541736667047
1989	6958.964624222728
1990	8563.34391392515
1991	8817.312909027967
1992	9566.726470442456
1993	8699.023869007686
1994	9136.754133234012
1995	10474.344838119054
1996	10726.217649120192
1997	10204.45789483491
1998	10561.044679117758
1999	10450.98966142623
2000	9804.587257503395
2001	9844.136531774611
2002	10718.55099691683
2003	13010.363135849155
2004	15167.549648731081
2005	16096.822680552821
2006	17330.257938719307
2007	20103.524001295973
2008	21713.15035656448
2009	19030.806515478223
2010	19523.83002557506
2011	21512.62781725687
2012	20603.647704722698
2013	21426.931265620573
2014	21647.593170850072
2015	18574.89375683287
2016	18447.870733445176
2017	19492.174026419398
2018	20752.762693590397
2019	20344.81085136881
2020	19474.39354566195
2021	21952.97076085774