Year	U.S. dollars (Billions)
1980	0.001
1981	0.014
1982	0.012
1983	0.009
1984	0.022
1985	0.001
1986	0.006
1987	0.013
1988	0.003
1989	0.012
1990	0.005
1991	-0.005
1992	-0.005
1993	-0.003
1994	-0.008
1995	-0.005
1996	-0.003
1997	0.001
1998	0.006
1999	-0.019
2000	0.003
2001	-0.004
2002	-0.016
2003	-0.025
2004	-0.010
2005	-0.036
2006	-0.026
2007	-0.034
2008	-0.062
2009	-0.048
2010	-0.040
2011	-0.059
2012	-0.050
2013	-0.026
2014	0.037
2015	-0.055
2016	-0.019
2017	-0.071
2018	0.031
2019	0.073
2020	-0.061
2021	-0.074
2022	-0.130
2023	-0.055
2024	-0.055
2025	-0.043
2026	-0.039
2027	-0.028
2028	-0.026
2029	-0.038