Year	U.S. dollars (Billions)
1980	-0.258
1981	-0.172
1982	-0.178
1983	-0.205
1984	-0.222
1985	-0.180
1986	-0.019
1987	-0.008
1988	-0.108
1989	-0.249
1990	-0.154
1991	-0.420
1992	-0.638
1993	0.110
1994	0.074
1995	-0.205
1996	-0.468
1997	-0.418
1998	0.292
1999	-0.170
2000	-0.489
2001	-0.316
2002	-0.393
2003	-0.297
2004	-0.788
2005	-0.995
2006	-1.284
2007	-2.565
2008	-4.121
2009	-1.740
2010	-2.764
2011	-0.638
2012	-0.967
2013	-0.352
2014	-0.942
2015	-0.089
2016	-0.880
2017	-1.157
2018	-1.013
2019	-1.442
2020	-2.513
2021	-1.791
2022	-2.321
2023	-2.989
2024	-2.927
2025	-3.072
2026	-3.215
2027	-3.299
2028	-3.471
2029	-3.590