Year	U.S. dollars (Billions)
1980	-0.007
1981	-0.279
1982	-0.130
1983	-0.101
1984	-0.075
1985	-0.296
1986	-0.302
1987	-0.401
1988	-0.133
1989	0.033
1990	-0.196
1991	-0.255
1992	-0.406
1993	-0.419
1994	-0.238
1995	-0.335
1996	-0.333
1997	-0.553
1998	-0.667
1999	-0.489
2000	-0.446
2001	-0.274
2002	-0.350
2003	0.084
2004	0.325
2005	0.622
2006	1.317
2007	1.591
2008	1.993
2009	0.814
2010	0.874
2011	0.537
2012	1.970
2013	1.054
2014	0.570
2015	-1.936
2016	-1.907
2017	-1.898
2018	-1.725
2019	-1.366
2020	-0.016
2021	1.057
2022	-0.194
2023	-2.346
2024	-2.795
2025	-3.051
2026	-3.110
2027	-3.081
2028	-3.245
2029	-3.452