Year	U.S. dollars (Billions)
1980	-2.573
1981	-5.721
1982	-2.917
1983	-2.436
1984	-2.495
1985	-0.952
1986	-2.859
1987	-4.235
1988	-1.572
1989	1.095
1990	4.665
1991	-0.429
1992	-6.468
1993	-8.043
1994	-10.981
1995	-5.104
1996	-7.157
1997	-12.288
1998	-14.641
1999	-12.094
2000	-9.144
2001	-3.952
2002	8.621
2003	7.972
2004	2.966
2005	4.929
2006	6.500
2007	6.048
2008	5.420
2009	7.253
2010	-1.623
2011	-5.339
2012	-2.138
2013	-13.126
2014	-9.180
2015	-17.623
2016	-15.104
2017	-31.151
2018	-27.084
2019	-3.490
2020	2.688
2021	6.645
2022	-4.289
2023	-22.700
2024	5.497
2025	5.012
2026	5.914
2027	7.258
2028	9.061
2029	10.297