Year	U.S. dollars (Billions)
1980	-0.117
1981	-0.035
1982	-0.006
1983	-0.004
1984	-0.013
1985	-0.006
1986	-0.001
1987	-0.004
1988	0.010
1989	0.005
1990	-0.008
1993	-0.017
1994	-0.010
1995	-0.016
1996	-0.053
1997	-0.005
1998	-0.010
1999	-0.012
2000	-0.035
2001	-0.033
2002	-0.033
2003	-0.039
2004	-0.026
2005	-0.065
2006	-0.045
2007	-0.066
2008	-0.118
2009	-0.113
2010	-0.155
2011	-0.105
2012	-0.063
2013	-0.093
2014	-0.090
2015	-0.134
2016	-0.136
2017	-0.111
2018	-0.158
2019	-0.111
2020	-0.054
2021	-0.087
2022	-0.090
2023	-0.096
2024	-0.120
2025	-0.094
2026	-0.078
2027	-0.064
2028	-0.055
2029	-0.046