Year	U.S. dollars (Billions)
1980	-1.403
1981	-0.478
1982	-0.923
1983	-1.124
1984	-0.021
1985	-0.806
1986	-0.693
1987	-1.731
1988	-2.694
1989	-5.797
1990	-7.159
1991	-6.866
1992	-5.275
1993	-1.304
1994	0.852
1995	5.143
1996	4.646
1997	6.038
1998	6.317
1999	6.560
2000	9.024
2001	9.942
2002	10.969
2003	7.404
2004	11.061
2005	5.898
2006	8.535
2007	10.328
2008	7.265
2009	5.053
2010	3.716
2011	-3.968
2012	-5.312
2013	-4.878
2014	-3.661
2015	-2.198
2016	-4.813
2017	-2.052
2018	-5.089
2019	-0.805
2020	1.440
2021	1.230
2022	-7.221
2023	-3.068
2024	-1.861
2025	-1.281
2026	-0.673
2027	-0.500
2028	-0.069
2029	-0.035