Year	U.S. dollars (Billions)
1980	-0.301
1981	-0.674
1982	-0.748
1983	-0.504
1984	-0.171
1985	-0.153
1986	-0.051
1987	0.000
1988	0.050
1989	-0.079
1990	-0.257
1991	-0.547
1992	-0.842
1993	-0.311
1994	-0.318
1995	-0.369
1996	-0.180
1997	-0.801
1998	-0.159
1999	0.244
2000	0.322
2001	0.365
2002	0.249
2003	-0.069
2004	-0.128
2005	-0.087
2006	0.154
2007	0.298
2008	-0.138
2009	-0.730
2010	-1.655
2011	-2.750
2012	-2.278
2013	-2.649
2014	-2.334
2015	-1.597
2016	-0.697
2017	-0.271
2018	-1.380
2019	0.920
2020	0.678
2021	0.348
2022	0.305
2023	0.135
2024	0.073
2025	0.347
2026	0.405
2027	0.466
2028	0.531
2029	0.452