Year	U.S. dollars (Billions)
1980	-0.124
1981	-0.140
1982	-0.115
1983	-0.103
1984	-0.119
1985	-0.210
1986	-0.254
1987	-0.214
1988	-0.241
1989	0.022
1990	-0.030
1991	0.041
1992	-0.008
1993	0.016
1994	-0.090
1995	-0.102
1996	-0.243
1997	-0.180
1998	-0.181
1999	-0.217
2000	-0.257
2001	-0.307
2002	-0.080
2003	-0.278
2004	-0.375
2005	-0.445
2006	-0.225
2007	-0.454
2008	-1.337
2009	-1.117
2010	-1.147
2011	-0.657
2012	-0.273
2013	-0.382
2014	-0.676
2015	-0.698
2016	-1.015
2017	-1.119
2018	-0.837
2019	-1.289
2020	-0.388
2021	-1.469
2022	-1.505
2023	-1.855
2024	-1.114
2025	-1.004
2026	-0.831
2027	-0.701
2028	-0.882
2029	-1.143