Year	U.S. dollars (Billions)
1980	8.215
1981	-3.963
1982	-1.579
1983	-1.643
1984	-1.468
1985	1.906
1986	-0.166
1987	-1.043
1988	-1.826
1989	-1.026
1990	2.147
1991	0.432
1992	1.791
1993	-0.844
1994	0.151
1995	0.948
1996	-0.080
1997	-0.109
1998	-0.558
1999	0.981
2000	5.238
2001	2.260
2002	-1.486
2003	-2.127
2004	7.031
2005	17.425
2006	28.093
2007	29.825
2008	37.083
2009	9.380
2010	14.578
2011	3.173
2012	23.837
2013	0.010
2014	-18.998
2015	-9.205
2016	-4.704
2017	4.414
2018	11.274
2019	4.642
2020	-4.792
2021	5.683
2022	12.401
2023	7.064
2024	9.830
2025	10.509
2026	9.376
2027	7.784
2028	6.984
2029	6.478