Year	U.S. dollars (Billions)
1980	0.001
1981	-0.010
1982	-0.052
1983	-0.037
1984	-0.030
1985	-0.027
1986	0.001
1987	0.007
1988	-0.025
1989	-0.075
1990	-0.096
1991	-0.165
1992	-0.069
1993	0.024
1994	-0.087
1995	-0.057
1996	-0.253
1997	-0.295
1998	-0.178
1999	-0.062
2000	-0.246
2001	-0.248
2002	-0.443
2003	-0.432
2004	-0.420
2005	-0.733
2006	-0.592
2007	-1.130
2008	-2.031
2009	-1.853
2010	-1.351
2011	-1.666
2012	-1.257
2013	-1.183
2014	-1.430
2015	-0.981
2016	-0.898
2017	-0.978
2018	-1.024
2019	-1.166
2020	-1.315
2021	-1.380
2022	-1.138
2023	-0.843
2024	-0.955
2025	-1.113
2026	-1.119
2027	-1.105
2028	-1.157
2029	-1.221