Year	U.S. dollars (Billions)
1980	-0.362
1981	-0.817
1982	-0.949
1983	-0.750
1984	-1.051
1985	-0.589
1986	-0.706
1987	-0.098
1988	0.097
1989	-0.298
1990	-0.685
1991	-0.572
1992	-1.008
1993	-0.872
1994	-0.288
1995	-0.847
1996	-0.541
1997	-0.677
1998	-0.722
1999	-0.524
2000	-1.062
2001	-1.225
2002	-0.952
2003	-0.965
2004	-0.988
2005	-0.583
2006	-0.918
2007	-1.257
2008	-2.081
2009	-1.568
2010	-2.468
2011	-3.869
2012	-4.110
2013	-4.466
2014	-4.689
2015	-4.186
2016	-3.893
2017	-4.080
2018	-4.443
2019	-3.274
2020	-2.506
2021	-2.781
2022	-3.984
2023	-1.306
2024	-1.895
2025	-2.085
2026	-2.575
2027	-2.520
2028	-2.366
2029	-2.494