Year	U.S. dollars (Billions)
1993	-0.651
1994	0.664
1995	0.538
1996	-2.094
1997	-1.930
1998	-2.185
1999	-0.932
2000	-0.639
2001	-1.709
2002	-1.892
2003	-1.668
2004	-2.526
2005	-3.579
2006	-4.039
2007	-3.707
2008	-6.178
2009	-3.075
2010	-4.224
2011	-4.867
2012	0.879
2013	1.831
2014	1.157
2015	-1.852
2016	-2.458
2017	-1.827
2018	-2.331
2019	-3.541
2020	0.588
2021	-2.918
2022	-9.419
2023	-2.741
2024	-6.134
2025	-5.428
2026	-4.822
2027	-4.424
2028	-3.944
2029	-3.592