Year	U.S. dollars (Billions)
1980	0.357
1981	0.415
1982	-0.599
1983	-0.947
1984	-0.467
1985	-0.048
1986	-0.412
1987	-0.225
1988	-0.089
1989	-0.039
1990	0.459
1991	-0.005
1992	0.139
1993	0.113
1994	0.218
1995	0.294
1996	0.105
1997	-0.614
1998	-0.644
1999	0.031
2000	0.544
2001	0.416
2002	0.076
2003	0.985
2004	1.793
2005	3.881
2006	7.125
2007	5.166
2008	8.499
2009	1.633
2010	4.172
2011	4.708
2012	3.867
2013	5.571
2014	4.155
2015	2.057
2016	-0.776
2017	1.409
2018	1.626
2019	1.020
2020	-1.356
2021	2.695
2022	5.382
2023	2.572
2024	1.606
2025	1.905
2026	1.827
2027	1.867
2028	1.996
2029	2.256