Year	U.S. dollars (Billions)
1980	-0.061
1981	-0.039
1982	-0.080
1983	-0.072
1984	-0.066
1985	-0.076
1986	-0.050
1987	-0.045
1988	-0.056
1989	-0.080
1990	-0.045
1991	-0.075
1992	-0.097
1993	-0.062
1994	-0.046
1995	-0.035
1996	-0.044
1997	-0.033
1998	-0.021
1999	-0.013
2000	0.011
2001	-0.016
2002	-0.015
2003	-0.014
2004	-0.009
2005	-0.010
2006	-0.039
2007	-0.031
2008	-0.029
2009	-0.048
2010	-0.071
2011	-0.014
2012	-0.083
2013	-0.048
2014	0.006
2015	0.021
2016	0.017
2017	0.004
2018	-0.054
2019	-0.127
2020	-0.039
2021	-0.014
2022	-0.164
2023	-0.185
2024	-0.121
2025	-0.108
2026	-0.107
2027	-0.113
2028	-0.117
2029	-0.125