Year	U.S. dollars (Billions)
1980	-12.320
1981	-18.278
1982	-1.785
1983	13.611
1984	11.233
1985	5.033
1986	0.555
1987	8.020
1988	-2.440
1989	-7.662
1990	-10.350
1991	-21.607
1992	-36.147
1993	-34.164
1994	-42.911
1995	-1.577
1996	-2.507
1997	-7.665
1998	-15.992
1999	-13.999
2000	-18.752
2001	-17.491
2002	-12.398
2003	-4.032
2004	-3.809
2005	-5.721
2006	-3.230
2007	-9.311
2008	-16.341
2009	-7.085
2010	-3.754
2011	-10.544
2012	-17.696
2013	-31.778
2014	-24.853
2015	-31.536
2016	-25.282
2017	-21.404
2018	-25.932
2019	-3.871
2020	26.905
2021	-4.494
2022	-17.667
2023	-5.715
2024	-15.341
2025	-16.459
2026	-19.454
2027	-21.865
2028	-23.036
2029	-23.672