Year	U.S. dollars (Billions)
1980	-0.069
1981	-0.145
1982	-0.256
1983	-0.053
1984	-0.130
1985	-0.116
1986	0.021
1987	-0.184
1988	-0.208
1989	-0.076
1990	-0.132
1991	-0.272
1992	-0.166
1993	0.043
1994	0.122
1995	0.013
1996	-0.182
1997	-0.178
1998	-0.612
1999	-0.639
2000	-0.920
2001	-0.350
2002	0.113
2003	-0.559
2004	-1.389
2005	-2.647
2006	-3.967
2007	-2.939
2008	-3.758
2009	-1.172
2010	-0.838
2011	-0.720
2012	-0.528
2013	1.008
2014	0.787
2015	0.986
2016	1.684
2017	1.044
2018	1.118
2019	1.616
2020	0.194
2021	-0.692
2022	-0.482
2023	0.300
2024	0.318
2025	0.276
2026	0.449
2027	0.552
2028	0.658
2029	0.726