Year	U.S. dollars (Billions)
1980	-0.277
1981	-0.374
1982	-0.375
1983	-0.248
1984	-0.317
1985	-0.252
1986	-0.365
1987	-0.490
1988	-0.210
1989	0.256
1990	0.390
1991	0.085
1992	-0.057
1993	0.059
1994	-0.274
1995	-0.217
1996	-0.069
1997	-0.549
1998	0.132
1999	0.139
2000	-0.247
2001	-0.032
2002	0.620
2003	0.017
2004	-0.010
2005	-0.068
2006	0.167
2007	0.779
2008	0.099
2009	0.397
2010	-0.294
2011	-0.211
2012	-0.554
2013	0.343
2014	-0.303
2015	-0.048
2016	1.662
2017	1.299
2018	-0.087
2019	-0.216
2020	0.669
2021	-0.347
2022	-2.993
2023	0.104
2024	0.262
2025	0.721
2026	0.728
2027	0.772
2028	0.744
2029	0.814