Year	current US$
1971	113356906.159624
1972	140648703.407973
1973	205572937.133349
1974	250532639.307922
1975	287313218.705379
1976	294765205.62363
1977	364682594.81755
1978	497491906.065995
1979	692279569.044587
1980	853329147.801217
1981	958344313.811763
1982	890474589.334729
1983	972789872.964586
1984	974679694.155389
1985	884399534.313623
1986	1113114467.64922
1987	1495000450.41951
1988	2048722819.17501
1989	2382101832.23916
1990	3194736754.90109
1991	3428974126.92551
1992	3650621980.3757
1993	3848750911.10172
1994	3411584912.69777
1995	3954827952.04984
1996	3888355951.01914
1997	4198679377.52897
1998	4298351083.82278
1999	4556080135.20476
2000	4710680414.02027
2001	4746490267.96625
2002	4081242782.34923
2003	5237420538.5756
2004	6062517104.3951
2005	7235142808.30252
2006	7218012866.80053
2007	7847014098.5123
2008	7904752831.84556
2009	7765036577.26165
2010	9479029569.81057
2011	12065564922.477
2012	11368847185.6933
2013	11361951476.8256
2014	12115807622.9991
2015	10484405172.8608
2016	10642842932.2276
2017	11452607126.919
2018	11818416043.6883
2019	12308111555.4803
2020	11619903781.6201
2021	13101223231.0675