Year	U.S. dollars (Billions)
1980	-0.071
1981	-0.024
1982	-0.013
1983	-0.012
1984	-0.007
1985	-0.005
1986	0.002
1987	0.014
1988	-0.006
1989	-0.026
1990	-0.018
1991	-0.017
1992	-0.020
1993	-0.033
1994	-0.046
1995	-0.062
1996	-0.035
1997	-0.030
1998	-0.058
1999	-0.083
2000	-0.060
2001	-0.060
2002	-0.069
2003	-0.091
2004	-0.133
2005	-0.034
2006	-0.060
2007	-0.196
2008	-0.245
2009	-0.248
2010	-0.207
2011	-0.304
2012	-0.219
2013	-0.090
2014	-0.169
2015	-0.051
2016	-0.064
2017	-0.137
2018	-0.099
2019	0.004
2020	-0.281
2021	-0.244
2022	-0.076
2023	-0.133
2024	-0.167
2025	-0.184
2026	-0.169
2027	-0.167
2028	-0.134
2029	-0.120