Year	current US$
1970	694.0962242292427
1971	749.2335332630846
1972	846.9996253883324
1973	1010.2871327578578
1974	1114.210591725239
1975	1216.812391053621
1976	1296.882815928545
1977	1436.8853566301425
1978	1667.8285504811086
1979	1857.2776843024456
1980	2034.7139291362726
1981	2083.54678133038
1982	2039.7308772349643
1983	2035.833583059894
1984	2087.1590843589897
1985	2148.860634441283
1986	2508.633959397988
1987	2797.296243808112
1988	3096.7150910854166
1989	3166.29158920044
1990	3490.2336772213953
1991	3615.6696381802813
1992	3823.6360674452967
1993	3811.571580224178
1994	4068.609758681978
1995	4465.505433714312
1996	4518.519720062646
1997	4452.395983580058
1998	4407.139010808892
1999	4496.246929596103
2000	4565.451808360559
2001	4484.4480015407535
2002	4590.271677951037
2003	5072.14707280523
2004	5648.244654428238
2005	6019.690587284916
2006	6465.743168615124
2007	7160.19681212608
2008	7637.688880128205
2009	7184.777259905032
2010	7793.897355623174
2011	8477.34919380704
2012	8604.385879149371
2013	8724.412492756823
2014	8892.76521623921
2015	8323.816601876424
2016	8356.30138890605
2017	8801.890862318767
2018	9174.154764043858
2019	9197.453969748793
2020	8768.450656370864
2021	9746.839435207135