Year	current US$
1971	5442016.5304
1972	3328816.1415
1973	8154453.9926
1974	97428899.1377
1975	399194822.7885001
1976	551025459.3439
1977	886130615.8669999
1978	1201599096.1163
1979	1730263527.2951999
1980	2251110544.9567003
1981	1863877129.0944993
1982	1696913004.7354
1983	1614679764.2861996
1984	1419871595.1483998
1985	1360687778.9076998
1986	1545383290.7772
1987	1500912371.9410002
1988	1481991462.2017002
1989	1279579046.2389996
1990	1413940721.1150815
1991	1424027370.005359
1992	1446302732.3744595
1993	1316537597.3502417
1994	1072702952.1144581
1995	1175750662.7455862
1996	1318671865.900092
1997	1337325216.0186503
1998	1363491996.7823145
1999	1588661271.6515357
2000	1632257524.4970026
2001	1755620913.2804017
2002	2088891248.3971758
2003	2244931606.41037
2004	2718258775.9511757
2005	3179762549.079235
2006	3793856953.5789857
2007	4523458708.976486
2008	5525032131.149403
2009	6165897700.66009
2010	7350645628.726776
2011	8035530704.232494
2012	8497761235.231608
2013	9944309594.091038
2014	9896975715.282026
2015	12609007876.70217
2016	10937085766.666403
2017	10496386976.561365
2018	11337729616.127464
2019	11140747360.502201
2020	10719553714.546247
2021	10256169851.880917
2022	10971847395.715311