Year	current US$
1967	176920510.45520267
1968	215141358.7269405
1969	262376941.25824746
1970	360975144.9768291
1971	410426233.21086293
1972	474752331.8344006
1973	513380965.9995168
1974	691201684.885608
1975	848499718.26779
1976	862733008.3342587
1977	894564759.4807745
1978	959841566.5718503
1979	956270149.2448765
1980	1117523023.1872592
1981	1132426378.7959418
1982	1042893472.6584647
1983	879902415.5904448
1984	830582592.4189638
1985	850944600.641956
1986	970770533.164248
1987	1295317493.3563113
1988	2171096019.649784
1989	2425868455.729546
1990	2521873010.924798
1991	2665012703.4714155
1992	2889489981.799631
1993	2930688335.939191
1994	3092316915.985257
1995	3434034986.8026595
1996	3603596670.512297
1997	3586440256.1492996
1998	2980555055.768678
1999	2856237720.846284
2000	2817759740.2491817
2019	10080812186.748455
2020	9915345448.808798
2021	10105061816.939638