Year	current US$
1970	529.0549943227156
1971	583.5025992099521
1972	637.9350660012426
1973	819.757099464893
1974	1021.8187516788744
1975	1044.0523310381427
1976	1127.0255964368282
1977	1211.9021543778033
1978	1334.7225199855704
1979	1510.408442878744
1980	1756.2734624214866
1981	1991.7746947576295
1982	1788.6227855371033
1983	1498.994733938594
1984	1474.0315366264979
1985	1425.503824331645
1986	1430.4992158889197
1987	1470.323585722681
1988	1636.8237767948938
1989	1757.4336159210065
1990	2002.1043037700576
1991	2174.825997548458
1992	2351.039276669671
1993	2705.251475279067
1994	3115.3432679911602
1995	3322.5157505659367
1996	3558.6331789184064
1997	3838.1513267137025
1998	3790.7865638700587
1999	3299.8428614503537
2000	3568.362447222157
2001	3440.757015308153
2002	3006.449855324146
2003	2992.7956165724795
2004	3379.1407210892653
2005	4019.597597663291
2006	4692.095486386921
2007	5538.962808783599
2008	6358.16819393827
2009	5901.664793158971
2010	7177.798753408841
2011	7937.643157128153
2012	7879.969743943525
2013	8063.171637527095
2014	8145.941510561368
2015	6867.809222815651
2016	6598.995671079145
2017	7301.983099588401
2018	6982.294074194456
2019	6847.182625209696
2020	5721.123448512059
2021	6358.946731682525