Year	U.S. dollars (Billions)
1980	-0.167
1981	-0.461
1982	-0.332
1983	-0.401
1984	0.210
1985	-0.161
1986	-0.601
1987	-0.223
1988	-0.445
1989	-0.085
1990	-0.251
1991	-0.462
1992	-0.317
1993	-0.553
1994	-0.793
1995	-0.625
1996	-0.651
1997	-0.156
1998	-0.241
1999	-0.231
2000	0.633
2001	-0.037
2002	0.192
2003	0.529
2004	0.673
2005	0.404
2006	1.120
2007	-2.108
2008	0.869
2009	-1.370
2010	0.902
2011	2.062
2012	2.415
2013	1.934
2014	0.187
2015	-4.636
2016	-4.945
2017	-0.458
2018	2.706
2019	1.618
2020	1.441
2021	1.714
2022	2.589
2023	0.466
2024	0.394
2025	-0.009
2026	-0.219
2027	-0.311
2028	-0.587
2029	-0.652