Year	current US$
1970	494196280.497485
1971	610415417.997578
1972	775330046.431336
1973	1036766782.62703
1974	1273197270.31802
1975	1609307545.23189
1976	1809479424.71428
1977	2117673553.40938
1978	2672097052.02312
1979	3185085598.55893
1980	3532329671.34652
1981	3405770575.42768
1982	3493625849.80237
1983	3470486961.85078
1984	3268307390.13823
1985	3405964418.06332
1986	5044716000
1987	6201933336.96125
1988	6417941932.46405
1989	6279535427.97714
1990	7692105859.85719
1991	8335854123.74779
1992	9191344659.40394
1993	8972634109.78351
1994	10178965893.8813
1995	12245665893.2714
1996	11618757213.4131
1997	11209318633.5657
1998	12318230179.8358
1999	12444138750.3595
2000	10486248299.9668
2001	10655993810.636
2002	11403555350.464
2003	13787068862.6703
2004	15473566428.8337
2005	16055026393.1866
2006	17089221061.747
2007	19478541562.3641
2008	22087744652.1658
2009	22287947468.9573
2010	21360049278.66
2011	23389597878.7413
2012	21351372422.9522
2013	22777598317.1777
2014	22909351944.0208
2015	19698349035.6868
2016	20335549325.067
2017	20913121283.8726
2018	22081658341.9491
2019	21586838446.2502
2020	21379238418.2904
2021	23494511993.3821