Year	U.S. dollars (Billions)
1980	0.754
1981	0.798
1982	0.714
1983	0.734
1984	0.628
1985	0.497
1986	0.635
1987	0.831
1988	0.986
1989	1.006
1990	1.237
1991	1.285
1992	1.425
1993	1.497
1994	1.621
1995	1.932
1996	1.830
1997	1.957
1998	1.797
1999	1.764
2000	1.739
2001	1.544
2002	1.436
2003	2.198
2004	2.774
2005	3.177
2006	3.293
2007	3.465
2008	3.298
2009	3.596
2010	4.438
2011	4.826
2012	4.887
2013	4.600
2014	4.426
2015	4.061
2016	3.815
2017	4.407
2018	4.667
2019	4.495
2020	3.984
2021	4.851
2022	4.791
2023	4.868
2024	5.085
2025	5.306
2026	5.527
2027	5.776
2028	6.010
2029	6.198