Year	current US$
1970	3414.622293799428
1971	3758.307737787524
1972	4257.451046059896
1973	4839.689667577622
1974	5712.946183043787
1975	6148.6250438164
1976	7231.924597487366
1977	7288.63141217861
1978	7439.3067452061805
1979	7922.762840930851
1980	8745.604821132707
1981	9752.938458491377
1982	9873.077907017463
1983	10706.57485071601
1984	11097.109824050389
1985	11332.258972115442
1986	11704.987163297112
1987	13252.829639080728
1988	15354.49804778871
1989	16740.828939883337
1990	17207.343172986282
1991	17586.4766020718
1992	16735.09110173121
1993	16170.209939432167
1994	16017.944157000376
1995	16619.92657840728
1996	17002.699841705322
1997	17542.888960405468
1998	16794.229268229104
1999	17868.200033476478
2000	19386.4454096933
2001	18986.18294037482
2002	19537.081005584998
2003	22686.55397254335
2004	26003.164647179525
2005	29229.897191355405
2006	33132.78863069891
2007	36533.917459509576
2008	37787.147044501486
2009	32986.04810497861
2010	38678.18058655671
2011	42617.974060283435
2012	43024.450803671316
2013	43054.54264518803
2014	41608.03614682041
2015	35364.11910717832
2016	34318.54492371687
2017	36906.31171710907
2018	37828.316857249636
2019	37785.727608927205
2020	34953.036361061364
2021	41986.23285958836