Year	U.S. dollars (Billions)
1980	-0.521
1981	-0.407
1982	-0.523
1983	-0.305
1984	-0.359
1985	-0.375
1986	-0.321
1987	-0.407
1988	-0.357
1989	-0.335
1990	-0.559
1991	-0.737
1992	-0.714
1993	-0.895
1994	-0.637
1995	-0.590
1996	-0.413
1997	-0.436
1998	-0.704
1999	-0.777
2000	-0.397
2001	-0.309
2002	-0.174
2003	-0.160
2004	-0.500
2005	-0.907
2006	-1.343
2007	-1.831
2008	-2.126
2009	-2.179
2010	-2.352
2011	-3.571
2012	-4.586
2013	-4.891
2014	-4.897
2015	-3.670
2016	-2.101
2017	-1.535
2018	-1.936
2019	-1.770
2020	-1.566
2021	-2.614
2022	-4.135
2023	-4.207
2024	-3.327
2025	-3.066
2026	-2.899
2027	-2.755
2028	-2.740
2029	-2.743