Year	U.S. dollars (Billions)
1980	0.014
1981	0.005
1982	-0.071
1983	-0.079
1984	-0.094
1985	-0.078
1986	-0.093
1987	-0.083
1988	-0.057
1989	-0.071
1990	-0.028
1991	-0.025
1992	-0.070
1993	-0.040
1994	-0.034
1995	0.045
1996	0.045
1997	0.018
1998	0.039
1999	0.009
2000	-0.040
2001	-0.039
2002	-0.081
2003	-0.138
2004	-0.122
2005	-0.235
2006	-0.038
2007	0.084
2008	-0.111
2009	-0.076
2010	-0.319
2011	-0.659
2012	-0.388
2013	-0.469
2014	-0.491
2015	-0.551
2016	-0.653
2017	-0.541
2018	-0.462
2019	-0.502
2020	-0.382
2021	-0.293
2022	-0.806
2023	-1.001
2024	-0.381
2025	-0.217
2026	-0.364
2027	-0.462
2028	-0.490
2029	-0.401