Year	U.S. dollars (Billions)
1980	-0.329
1981	-0.535
1982	-0.194
1983	0.199
1984	-0.202
1985	0.075
1986	-0.099
1987	0.545
1988	0.721
1989	0.112
1990	0.209
1991	-0.241
1992	-0.264
1993	-0.096
1994	0.016
1995	-0.471
1996	-0.201
1997	-0.507
1998	-1.016
1999	-1.159
2000	-0.699
2001	-0.191
2002	-0.113
2003	-0.575
2004	-1.045
2005	-1.064
2006	-0.463
2007	-1.180
2008	-2.287
2009	-0.212
2010	-3.121
2011	-4.517
2012	-3.735
2013	-4.084
2014	-6.677
2015	-4.848
2016	-4.508
2017	-3.745
2018	-5.306
2019	-4.025
2020	-0.189
2021	-2.051
2022	-3.001
2023	1.688
2024	-1.795
2025	-3.114
2026	-3.269
2027	-3.169
2028	-2.645
2029	-2.571