Year	U.S. dollars (Billions)
1980	-3.090
1981	-1.901
1982	-0.952
1983	-1.923
1984	-1.439
1985	-1.013
1986	-1.465
1987	-0.806
1988	1.596
1989	0.961
1990	-2.625
1991	0.909
1992	-0.974
1993	-6.433
1994	2.631
1995	-2.339
1996	-2.437
1997	-2.638
1998	2.000
1999	-0.925
2000	-9.920
2001	3.760
2002	-0.626
2003	-7.554
2004	-14.198
2005	-20.980
2006	-31.168
2007	-36.949
2008	-39.425
2009	-11.358
2010	-44.616
2011	-74.402
2012	-47.278
2013	-55.092
2014	-38.020
2015	-26.625
2016	-26.668
2017	-39.955
2018	-20.151
2019	10.798
2020	-31.914
2021	-7.398
2022	-49.085
2023	-45.150
2024	-30.870
2025	-24.206
2026	-20.098
2027	-21.124
2028	-21.969
2029	-23.275