Year	U.S. dollars (Billions)
1980	-0.010
1981	-0.005
1982	-0.004
1983	-0.010
1984	-0.004
1985	0.006
1986	0.011
1987	0.020
1988	0.022
1989	0.022
1990	0.029
1991	0.006
1992	-0.020
1993	-0.054
1994	-0.011
1995	-0.018
1996	-0.007
1997	-0.035
1998	-0.022
1999	-0.079
2000	-0.051
2001	-0.059
2002	-0.036
2003	-0.031
2004	-0.122
2005	-0.273
2006	-0.302
2007	-0.266
2008	-0.610
2009	-0.226
2010	-0.190
2011	-0.390
2012	-0.192
2013	-0.141
2014	-0.135
2015	-0.307
2016	-1.032
2017	-0.995
2018	-1.503
2019	-1.490
2020	-1.300
2021	-0.453
2022	-1.004
2023	-1.525
2024	-1.394
2025	-1.101
2026	-1.090
2027	-0.908
2028	-0.932
2029	-1.018