Year	U.S. dollars (Billions)
1980	-0.663
1981	-0.420
1982	-0.240
1983	-0.283
1984	-0.156
1985	-0.130
1986	-0.074
1987	-0.229
1988	-0.160
1989	-0.376
1990	-0.447
1991	-0.224
1992	-0.409
1993	-0.690
1994	-0.513
1995	-0.373
1996	-0.275
1997	-0.460
1998	-0.491
1999	-0.694
2000	-0.685
2001	-0.514
2002	-0.860
2003	-0.900
2004	-0.675
2005	-0.860
2006	-0.939
2007	-1.499
2008	-2.581
2009	-0.561
2010	-1.214
2011	-2.265
2012	-2.411
2013	-2.431
2014	-2.453
2015	-1.921
2016	-1.257
2017	-2.189
2018	-1.867
2019	-0.826
2020	-0.632
2021	-2.061
2022	-2.588
2023	-1.227
2024	-1.981
2025	-1.927
2026	-1.839
2027	-1.812
2028	-1.845
2029	-1.821