Year	U.S. dollars (Billions)
1980	-0.165
1981	-0.132
1982	-0.170
1983	-0.018
1984	-0.023
1985	0.003
1986	0.141
1987	-0.030
1988	-0.003
1989	-0.060
1990	-0.069
1991	0.015
1992	-0.005
1993	-0.058
1994	-0.089
1995	-0.118
1996	-0.151
1997	-0.055
1998	-0.033
1999	-0.099
2000	-0.112
2001	-0.098
2002	-0.073
2003	-0.083
2004	-0.099
2005	-0.105
2006	-0.095
2007	-0.160
2008	-0.225
2009	-0.327
2010	-0.585
2011	-1.914
2012	-1.210
2013	-0.737
2014	-0.473
2015	-1.003
2016	-0.294
2017	-0.680
2018	-0.698
2019	-0.792
2020	-0.320
2021	-0.395
2022	-0.449
2023	-0.156
2024	-0.127
2025	-0.171
2026	-0.186
2027	-0.151
2028	-0.266
2029	-0.232