Year	U.S. dollars (Billions)
1980	0.374
1981	-0.039
1982	-0.333
1983	-0.391
1984	-0.265
1985	-0.260
1986	-0.040
1987	-0.352
1988	-0.294
1989	0.385
1990	-0.227
1991	-0.394
1992	-0.835
1993	-0.629
1994	-0.398
1995	-0.259
1996	-0.222
1997	0.029
1998	0.014
1999	0.405
2000	0.027
2001	-0.025
2002	0.502
2003	1.199
2004	0.039
2005	-2.272
2006	-1.726
2007	-2.874
2008	-2.055
2009	-1.245
2010	-1.885
2011	-2.960
2012	-4.718
2013	-3.509
2014	-2.612
2015	-3.474
2016	-3.857
2017	-4.399
2018	-2.967
2019	-0.774
2020	-2.508
2021	-3.723
2022	-3.870
2023	-3.577
2024	-3.396
2025	-2.546
2026	-2.433
2027	-2.541
2028	-2.983
2029	-3.004