Year	U.S. dollars (Billions)
1980	-0.556
1981	-0.363
1982	-0.299
1983	-0.247
1984	-0.193
1985	-0.184
1986	-0.143
1987	-0.141
1988	-0.150
1989	-0.084
1990	-0.265
1991	-0.230
1992	-0.198
1993	-0.258
1994	-0.277
1995	-0.276
1996	-0.153
1997	-0.202
1998	-0.289
1999	-0.225
2000	-0.260
2001	-0.140
2002	-0.477
2003	-0.328
2004	-0.399
2005	-0.734
2006	-0.586
2007	-0.843
2008	-1.677
2009	-1.748
2010	-0.893
2011	-0.777
2012	-0.864
2013	-0.808
2014	-0.034
2015	-0.184
2016	0.057
2017	-0.056
2018	0.099
2019	-0.323
2020	-0.701
2021	-0.707
2022	-0.822
2023	-0.705
2024	-0.785
2025	-0.846
2026	-0.899
2027	-0.952
2028	-1.046
2029	-1.159