Year	U.S. dollars (Billions)
1980	5.178
1981	-6.474
1982	-7.282
1983	-4.332
1984	0.123
1985	2.604
1986	0.211
1987	-0.073
1988	-0.296
1989	1.090
1990	4.988
1991	1.203
1992	2.268
1993	-0.780
1994	-2.128
1995	-2.578
1996	3.507
1997	0.552
1998	-4.244
1999	0.506
2000	7.427
2001	2.478
2002	1.083
2003	3.391
2004	16.841
2005	36.529
2006	36.518
2007	27.648
2008	29.145
2009	13.869
2010	13.111
2011	10.668
2012	17.374
2013	19.049
2014	0.907
2015	-15.439
2016	5.077
2017	13.564
2018	7.283
2019	-13.685
2020	-15.986
2021	-3.254
2022	1.019
2023	1.211
2024	1.432
2025	-0.150
2026	-0.354
2027	-0.816
2028	-1.224
2029	-2.581