Year	constant 2015 US$
1990	9049351183.197794
1991	12225093436.654621
1992	18741956912.888325
1993	21483337836.602535
1994	22086541307.49282
1995	23141785227.358433
1996	24413618177.98318
1997	24263642204.573772
1998	24861135920.020905
1999	25145033519.924572
2000	25464671220.79312
2001	26788978447.78724
2002	27557076075.523247
2003	28442042816.80318
2004	29874849595.020554
2005	29135698339.285873
2006	30015606379.319168
2007	32144920278.23173
2008	34905049601.24096
2009	39564175211.04512
2010	42415591619.86426
2011	41268347118.46092
2012	45006652201.245705
2013	47236360671.46127
2014	50011913481.09895
2015	51595443854.06302
2016	52813414113.13013
2017	53610368616.4828
2018	52976618618.792336
2019	52228316843.32877
2020	40819088965.22324
2021	37971287848.18018
2022	39216752700.669716
2023	38998268384.149994