Year	U.S. dollars (Billions)
1980	-1.826
1981	-1.411
1982	-1.016
1983	-0.929
1984	-0.073
1985	0.068
1986	-0.298
1987	-0.968
1988	-1.239
1989	-0.966
1990	-1.214
1991	-1.074
1992	-1.013
1993	-0.892
1994	-0.014
1995	-0.492
1996	-0.162
1997	-0.155
1998	-0.290
1999	-0.120
2000	-0.241
2001	-0.061
2002	0.768
2003	0.294
2004	0.241
2005	0.040
2006	0.479
2007	-0.139
2008	0.453
2009	1.624
2010	0.465
2011	2.666
2012	-0.321
2013	-0.423
2014	0.511
2015	-0.201
2016	-0.414
2017	-1.049
2018	-2.285
2019	-1.349
2020	-1.974
2021	-2.874
2022	-5.517
2023	-4.827
2024	-3.319
2025	-2.401
2026	-2.248
2027	-2.242
2028	-2.343
2029	-2.117