Year	U.S. dollars (Billions)
1980	-1.971
1981	-4.733
1982	-2.304
1983	-1.117
1984	-2.111
1985	-1.413
1986	-1.191
1987	-0.735
1988	-0.231
1989	-0.691
1990	-0.484
1991	-0.099
1992	-0.958
1993	-2.554
1994	-1.585
1995	-1.345
1996	-2.984
1997	-3.554
1998	-3.820
1999	0.194
2000	-0.791
2001	-0.998
2002	-0.480
2003	0.164
2004	3.230
2005	2.339
2006	8.456
2007	8.723
2008	-7.532
2009	2.473
2010	1.944
2011	-12.361
2012	-14.230
2013	-13.247
2014	-8.982
2015	-6.629
2016	-6.535
2017	-7.616
2018	-13.264
2019	-14.506
2020	-4.952
2021	-22.960
2022	-26.163
2023	-11.901
2024	-13.162
2025	-13.708
2026	-13.913
2027	-13.731
2028	-13.704
2029	-13.271