Year	U.S. dollars (Billions)
1980	-0.642
1981	-0.998
1982	-1.182
1983	-0.115
1984	-0.273
1985	0.076
1986	-0.582
1987	-1.187
1988	-0.680
1989	-0.715
1990	-0.360
1991	-0.708
1992	-0.122
1993	-0.849
1994	-0.898
1995	-1.000
1996	-0.055
1997	-0.457
1998	-2.099
1999	0.918
2000	1.113
2001	-0.551
2002	-1.219
2003	-0.387
2004	-0.479
2005	0.474
2006	1.740
2007	1.886
2008	1.769
2009	0.313
2010	-1.582
2011	-0.400
2012	-0.146
2013	-0.933
2014	-0.669
2015	-2.221
2016	1.093
2017	-0.184
2018	-1.312
2019	-0.216
2020	2.208
2021	3.098
2022	2.115
2023	1.454
2024	1.114
2025	1.491
2026	1.631
2027	1.731
2028	1.822
2029	1.810