Year	U.S. dollars (Billions)
1980	-1.045
1981	-2.360
1982	-2.218
1983	-1.291
1984	-0.269
1985	0.051
1986	-1.371
1987	-1.795
1988	-1.793
1989	-0.219
1990	-1.458
1991	-1.517
1992	-1.916
1993	-2.463
1994	-2.698
1995	-4.623
1996	-3.645
1997	-3.367
1998	-3.339
1999	-1.380
2000	-1.545
2001	-1.200
2002	-1.096
2003	-0.932
2004	0.062
2005	1.160
2006	2.913
2007	1.520
2008	-5.286
2009	-0.633
2010	-3.562
2011	-3.376
2012	-5.374
2013	-9.606
2014	-8.582
2015	-8.772
2016	-4.218
2017	-1.733
2018	-2.648
2019	-1.281
2020	2.236
2021	-5.064
2022	-9.908
2023	1.676
2024	-3.187
2025	-4.033
2026	-4.389
2027	-4.656
2028	-4.828
2029	-5.038