Year	U.S. dollars (Billions)
1980	0.012
1981	0.023
1982	0.019
1983	0.038
1984	0.009
1985	-0.087
1986	-0.059
1987	-0.026
1988	0.026
1989	-0.051
1990	-0.046
1991	-0.066
1992	-0.086
1993	-0.117
1994	-0.038
1995	-0.170
1996	-0.196
1997	-0.195
1998	-0.154
1999	-0.169
2000	-0.214
2001	-0.576
2002	-1.898
2003	-1.359
2004	-0.758
2005	-0.504
2006	-0.322
2007	0.670
2008	0.414
2009	-0.501
2010	-0.411
2011	-0.032
2012	-0.344
2013	-1.084
2014	-0.436
2015	-0.702
2016	-0.616
2017	-0.798
2018	-0.646
2019	-0.494
2020	-0.407
2021	-0.308
2022	0.882
2023	-0.432
2024	-0.432
2025	-0.589
2026	-0.636
2027	-0.577
2028	-0.626
2029	-0.670