Year	U.S. dollars (Billions)
1980	-4.938
1981	-4.186
1982	-2.607
1983	-0.497
1984	-0.055
1985	0.675
1986	3.069
1987	2.801
1988	3.599
1989	3.604
1990	3.637
1991	4.763
1992	6.664
1993	11.251
1994	12.600
1995	15.391
1996	13.836
1997	13.842
1998	13.255
1999	20.070
2000	9.393
2001	7.896
2002	11.622
2003	10.806
2004	11.434
2005	7.701
2006	7.554
2007	7.044
2008	-5.203
2009	8.000
2010	7.824
2011	-10.150
2012	-0.404
2013	4.982
2014	4.133
2015	6.395
2016	2.625
2017	3.510
2018	-4.968
2019	0.527
2020	7.426
2021	7.869
2022	-5.908
2023	-0.623
2024	-3.391
2025	-2.507
2026	-1.600
2027	-0.209
2028	0.817
2029	1.614