Year	U.S. dollars (Billions)
1980	4.246
1981	4.385
1982	4.232
1983	3.653
1984	3.003
1985	2.848
1986	1.962
1987	2.431
1988	4.095
1989	4.365
1990	4.085
1991	3.690
1992	3.614
1993	3.549
1994	3.657
1995	3.799
1996	3.599
1997	4.303
1998	3.538
1999	3.405
2000	3.601
2001	3.870
2002	4.194
2003	4.902
2004	6.221
2005	8.329
2006	12.762
2007	14.060
2008	17.914
2009	15.332
2010	20.264
2011	23.455
2012	25.502
2013	28.042
2014	27.145
2015	21.245
2016	20.965
2017	25.874
2018	26.312
2019	23.309
2020	18.138
2021	22.096
2022	29.122
2023	28.406
2024	29.872
2025	32.410
2026	35.064
2027	38.035
2028	41.233
2029	44.601