Year	U.S. dollars (Billions)
1980	3.287
1981	-5.143
1982	-3.422
1983	-0.404
1984	-1.873
1985	2.321
1986	2.775
1987	5.105
1988	2.567
1989	1.514
1990	1.545
1991	1.416
1992	1.963
1993	2.778
1994	0.016
1995	-2.494
1996	-1.656
1997	-2.221
1998	-2.368
1999	-0.680
2000	-0.172
2001	0.333
2002	1.044
2003	-1.447
2004	-6.332
2005	-8.063
2006	-12.248
2007	-16.121
2008	-15.881
2009	-8.063
2010	-5.576
2011	-9.204
2012	-20.371
2013	-21.353
2014	-18.321
2015	-15.043
2016	-8.656
2017	-9.028
2018	-11.865
2019	-10.137
2020	6.574
2021	15.334
2022	-1.834
2023	-6.123
2024	-6.645
2025	-7.411
2026	-7.923
2027	-8.532
2028	-9.042
2029	-9.791