Year	U.S. dollars (Billions)
1980	-0.589
1981	-0.869
1982	-0.741
1983	-0.329
1984	-0.332
1985	-0.350
1986	-0.286
1987	-0.104
1988	0.015
1989	-0.151
1990	-0.093
1991	0.009
1992	-0.118
1993	-0.088
1994	0.047
1995	-0.145
1996	-0.122
1997	-0.182
1998	-0.570
1999	-0.386
2000	-0.438
2001	-0.674
2002	-0.509
2003	-0.507
2004	-0.188
2005	-0.232
2006	0.593
2007	-0.174
2008	-0.597
2009	0.913
2010	1.525
2011	1.093
2012	1.248
2013	-0.218
2014	0.581
2015	-0.571
2016	-0.685
2017	-0.435
2018	-0.341
2019	0.101
2020	1.922
2021	2.138
2022	1.067
2023	-0.506
2024	1.119
2025	1.691
2026	2.404
2027	3.414
2028	3.604
2029	3.941