Year	U.S. dollars (Billions)
1980	-0.006
1981	-0.021
1982	-0.004
1983	-0.006
1985	-0.029
1986	0.008
1988	-0.021
1989	-0.026
1990	-0.026
1991	-0.036
1992	-0.007
1993	-0.007
1994	0.001
1995	-0.085
1996	-0.035
1997	-0.021
1998	-0.006
1999	0.014
2000	-0.031
2001	-0.026
2002	-0.015
2003	0.021
2004	0.061
2005	-0.029
2006	-0.043
2007	-0.080
2008	-0.111
2009	-0.131
2010	-0.223
2011	-0.076
2012	0.016
2013	-0.039
2014	-0.050
2015	-0.035
2016	-0.049
2017	-0.063
2018	-0.048
2019	-0.154
2020	-0.025
2021	-0.079
2022	-0.222
2023	-0.159
2024	-0.080
2025	-0.110
2026	-0.110
2027	-0.088
2028	-0.088
2029	-0.087