Year	U.S. dollars (Billions)
1980	-1.904
1981	-2.061
1982	-3.200
1983	-2.771
1984	-1.294
1985	-0.036
1986	0.952
1987	-0.444
1988	-0.390
1989	-1.456
1990	-2.695
1991	-1.034
1992	-1.000
1993	-3.016
1994	-2.950
1995	-1.980
1996	-3.953
1997	-4.351
1998	1.546
1999	-2.875
2000	-2.228
2001	-1.750
2002	-0.282
2003	0.285
2004	1.625
2005	1.990
2006	6.963
2007	8.072
2008	0.144
2009	8.448
2010	7.179
2011	5.643
2012	6.949
2013	11.384
2014	10.756
2015	7.266
2016	-1.199
2017	-2.143
2018	-8.877
2019	-3.047
2020	11.578
2021	-5.943
2022	-18.261
2023	-11.206
2024	-10.163
2025	-8.288
2026	-7.189
2027	-6.749
2028	-6.730
2029	-6.381