Year	U.S. dollars (Billions)
1980	-0.082
1981	-0.105
1982	-0.075
1983	-0.071
1984	-0.068
1985	-0.058
1986	-0.038
1987	-0.025
1988	-0.018
1990	-0.050
1991	-0.104
1992	-0.075
1993	-0.062
1994	-0.016
1995	-0.039
1996	-0.040
1997	-0.012
1998	0.016
1999	-0.044
2000	-0.040
2001	-0.074
2002	-0.030
2003	-0.044
2004	-0.056
2005	0.031
2006	-0.069
2007	-0.085
2008	-0.205
2009	-0.122
2010	-0.102
2011	-0.327
2012	-0.449
2013	-0.561
2014	-1.098
2015	-0.758
2016	-0.238
2017	-0.325
2018	-0.474
2019	-0.169
2020	0.052
2021	0.088
2022	-0.464
2023	-0.683
2024	-0.189
2025	-0.296
2026	-0.230
2027	-0.298
2028	-0.263
2029	-0.233