Year	U.S. dollars (Billions)
1980	38.616
1981	45.681
1982	49.932
1983	46.619
1984	50.612
1985	50.607
1986	51.827
1987	54.171
1988	62.385
1989	65.042
1990	65.276
1991	74.158
1992	79.338
1993	83.969
1994	84.642
1995	98.917
1996	103.296
1997	101.848
1998	101.381
1999	96.008
2000	99.421
2001	96.784
2002	98.169
2003	112.507
2004	132.206
2005	145.209
2006	161.871
2007	184.141
2008	202.204
2009	187.074
2010	196.712
2011	230.577
2012	250.094
2013	258.674
2014	271.422
2015	299.930
2016	313.623
2017	339.229
2018	356.163
2019	321.071
2020	300.410
2021	348.481
2022	374.748
2023	338.237