Year	constant 2015 US$
1981	41207687487.20328
1982	35179868843.55706
1983	24967289361.94564
1984	23166191072.30141
1985	24374423052.212112
1986	22142802092.668285
1987	25976441549.99264
1988	29908017510.22575
1989	25185816737.26642
1990	26999032832.745853
1991	29397032864.777664
1992	32942445901.806793
1993	27174068662.851963
1994	23745263458.65566
1995	20455828358.808002
1996	21106626791.240963
1997	21538698537.581627
1998	20524564681.91417
1999	21000246734.77572
2000	21035791493.069046
2001	21528777638.76939
2002	25346129757.64302
2003	22606710801.68383
2004	22366539477.89492
2005	22881632058.561333
2006	23067618906.55508
2007	23089528013.18649
2008	23781567563.66203
2009	24639619053.999435
2010	25256074168.151287
2011	29755546543.551655
2012	33760422762.81343
2013	41119215813.94533
2014	47173512265.33365
2015	46484711768.25761
2016	44477671318.90076
2017	44383555677.556946
2018	45312975462.81121
2019	45660495430.37783
2020	44402577869.16314
2021	45889338256.729965
2022	47012419690.6561
2023	47672766948.35656