Year	U.S. dollars (Billions)
1980	-0.445
1981	-0.482
1982	-0.386
1983	-0.412
1984	-0.169
1985	-0.562
1986	-0.452
1987	-0.893
1988	-0.426
1989	-0.290
1990	-0.551
1991	-0.336
1992	-0.366
1993	-0.512
1994	-0.056
1995	0.090
1996	-0.287
1997	-0.582
1998	-0.151
1999	-0.510
2000	-0.218
2001	-0.348
2002	-0.439
2003	-0.598
2004	-0.416
2005	-0.496
2006	0.194
2007	0.286
2008	-0.452
2009	-1.123
2010	-0.857
2011	-0.749
2012	-0.956
2013	-1.128
2014	-1.402
2015	-1.174
2016	-1.037
2017	-0.950
2018	-1.409
2019	-1.695
2020	-1.517
2021	-1.799
2022	-1.514
2023	-1.386
2024	-1.478
2025	-1.640
2026	-1.711
2027	-1.773
2028	-1.927
2029	-2.074