Year	U.S. dollars (Billions)
1980	-3.417
1981	-3.986
1982	-1.941
1983	-1.581
1984	-1.083
1985	-0.982
1986	-1.106
1987	-0.379
1988	-0.107
1989	-1.409
1990	3.067
1991	-2.146
1992	-3.104
1993	-5.788
1994	0.634
1995	0.854
1996	-3.264
1997	-5.744
1998	-6.901
1999	-12.487
2000	-10.343
2001	-5.946
2002	-5.544
2003	-5.473
2004	-15.297
2005	-10.146
2006	-16.081
2007	-28.722
2008	-36.135
2009	-17.394
2010	-24.627
2011	-26.868
2012	-20.344
2013	-10.095
2014	-15.923
2015	-6.170
2016	-4.808
2017	-6.016
2018	-11.352
2019	-1.445
2020	14.764
2021	-8.515
2022	-16.697
2023	12.769
2024	5.631
2025	-1.465
2026	-4.581
2027	-5.850
2028	-7.914
2029	-10.290