Year	current US$
1970	196.89899722144816
1971	139.40131919206559
1972	163.3321126807213
1973	195.09963297452046
1974	242.79509684202813
1975	292.3428943369876
1976	351.0220428320964
1977	349.5438947755269
1978	382.7546942966575
1979	393.13951678002434
1980	516.6473009791868
1981	1110.7102914277098
1982	976.5617813486496
1983	688.1306161176072
1984	544.7630594593304
1985	532.627900810825
1986	492.8683246914962
1987	478.27021865264743
1988	471.6983841796087
1989	393.47384289172936
1990	445.7217724632869
1991	439.96907214219857
1992	425.8210872739057
1993	336.7838193396277
1994	288.7101902737737
1995	354.66465996944214
1996	383.1729128810952
1997	380.81836165922266
1998	394.8787563913647
1999	413.6977052966249
2000	365.47533212707987
2001	397.20410036534383
2002	476.40222017816353
2003	528.934057874505
2004	627.7589558231027
2005	729.7473538977309
2006	972.9953664545569
2007	1096.522058726543
2008	1284.3821208675834
2009	1164.60126974899
2010	1278.343050126844
2011	1375.4590526350346
2012	1484.1968673250199
2013	1679.9656665406353
2014	1838.4648128158913
2015	1589.531108363909
2016	1397.764260111893
2017	1316.043520180272
2018	1412.503047004975
2019	1440.3278604843929
2020	1399.1519799327557
2021	1415.9825086756148