Year	current US$
1981	52893264977.32866
1982	48309546868.4714
1983	36693244971.44307
1984	28296275135.46487
1985	32265990697.044445
1986	29326281380.689507
1987	29769409611.644962
1988	34029207475.79336
1989	31863726739.072884
1990	33100873679.061745
1991	27106532074.770885
1992	21193931948.981686
1993	22976022389.43991
1994	28006349211.45641
1995	43035878069.69107
1996	53145488872.91839
1997	57625338900.9177
1998	58647412922.39643
1999	25300802246.802208
2000	26454821981.219727
2001	27158819897.589394
2002	29786638309.692387
2003	33395497022.231544
2004	39171195248.31052
2005	44889471593.48581
2006	53132455863.859184
2007	62894303583.52403
2008	75122188769.62973
2009	74422659058.85416
2010	77098665662.48543
2011	92820720617.71294
2012	101839260762.06895
2013	118068649303.35165
2014	129978945327.41216
2015	113837750121.62851
2016	98940843547.66495
2017	102011092715.4027
2018	117207373975.74416
2019	134175298445.71512
2020	131287581379.01048
2021	150816500321.44354
2022	162115376628.1418
2023	157934895648.10617