Year	U.S. dollars (Billions)
1980	-0.254
1981	-0.527
1982	-0.520
1983	-0.289
1984	0.036
1985	-0.092
1986	-0.444
1987	-1.088
1988	-0.585
1989	-0.862
1990	-0.715
1991	-0.944
1992	-0.757
1993	-0.373
1994	-0.278
1995	0.015
1996	-0.037
1997	-0.200
1998	-0.426
1999	-0.113
2000	0.196
2001	0.276
2002	0.418
2003	0.480
2004	0.210
2005	-0.389
2006	0.048
2007	0.527
2008	-0.151
2009	-1.123
2010	-2.174
2011	-1.281
2012	-1.260
2013	-3.109
2014	-1.723
2015	-1.484
2016	-1.504
2017	-1.241
2018	-1.672
2019	-1.620
2020	-1.052
2021	-0.587
2022	-3.282
2023	-3.624
2024	-3.036
2025	-2.626
2026	-2.518
2027	-2.245
2028	-2.984
2029	-3.668