Year	current US$
1971	15359999.6566772
1972	223759994.506836
1973	421470001.220703
1974	531390014.648438
1975	1055180053.71094
1976	491809997.558594
1977	772419982.910156
1978	958719970.703125
1979	1122180053.71094
1980	1229310058.59375
1981	1054290039.0625
1982	1304069946.28906
1983	993260009.765625
1984	1109040039.0625
1985	982750000
1986	1287989990.23438
1987	1619000000
1988	1392609985.35156
1989	1482660034.17969
1990	1788900024.41406
1991	1612219970.70313
1992	1498650024.41406
1993	1165369995.11719
1994	1384750000
1995	1033109985.35156
1996	964880004.882813
1997	863150024.414063
1998	979549987.792969
1999	1005429992.67578
2000	976340026.855469
2001	918450012.207031
2002	807400024.414063
2003	1301790039.0625
2004	1421300048.82813
2005	1251619995.11719
2006	1027819946.28906
2007	887989990.234375
2008	1142310058.59375
2009	978770019.53125
2010	1327329956.05469
2011	1437520019.53125
2012	2154050048.82813
2013	2633590087.89063
2014	2422639892.57813
2015	2592909912.10938
2016	2532820068.35938
2017	3781770019.53125
2018	3044760009.76563
2019	4381589843.75
2020	5374779785.15625
2021	5089109863.28125
2022	5192790039.0625