Year	U.S. dollars (Billions)
1980	-0.230
1981	-0.410
1982	-0.299
1983	-0.375
1984	-0.321
1985	-0.150
1986	-0.105
1987	-0.215
1988	-0.337
1989	-0.355
1990	-0.092
1991	-0.152
1992	-0.001
1993	0.518
1994	0.488
1995	0.917
1996	0.194
1997	-0.455
1998	-0.313
1999	-0.115
2000	0.229
2001	0.223
2002	0.062
2003	0.080
2004	-0.017
2005	0.625
2006	-0.097
2007	0.236
2008	0.633
2009	-1.275
2010	-1.404
2011	-1.728
2012	-4.255
2013	-5.083
2014	2.874
2015	2.375
2016	2.840
2017	3.627
2018	3.120
2019	3.655
2020	3.353
2021	3.466
2022	5.284
2023	5.145
2024	3.863
2025	4.693
2026	4.396
2027	3.745
2028	3.308
2029	3.455