Year	U.S. dollars (Billions)
1980	0.954
1981	0.122
1982	0.177
1983	0.036
1984	0.535
1985	-0.136
1986	-0.951
1987	-0.720
1988	-0.402
1989	-0.769
1990	-1.710
1991	-0.077
1992	-0.360
1993	-1.099
1994	-0.032
1995	-0.206
1996	0.441
1997	1.532
1998	0.172
1999	-0.398
2000	-0.412
2001	-0.514
2002	-0.103
2003	-0.715
2004	-1.119
2005	-2.816
2006	-5.253
2007	-10.616
2008	-12.026
2009	-4.326
2010	-0.874
2011	0.190
2012	-0.460
2013	0.711
2014	0.705
2016	1.651
2017	1.961
2018	0.628
2019	1.285
2020	0.028
2021	-1.450
2022	-1.264
2023	0.296
2024	-0.273
2025	-1.421
2026	-0.926
2027	-0.499
2028	-0.529
2029	-0.564