Year	U.S. dollars (Billions)
1990	0.737
1991	-0.500
1992	-0.414
1993	-0.467
1994	0.273
1995	0.039
1996	0.058
1997	0.022
1998	-0.318
1999	0.550
2000	1.337
2001	0.671
2002	0.443
2003	0.176
2004	0.225
2005	0.633
2006	0.232
2007	-1.508
2008	-1.251
2009	-2.527
2010	-1.054
2011	-0.982
2012	-0.606
2013	-1.242
2014	0.569
2015	-1.186
2016	-1.699
2017	-0.400
2018	-0.687
2019	-0.914
2020	-3.162
2021	-2.748
2022	-4.186
2023	-3.521
2024	-4.014
2025	-3.695
2026	-1.871
2027	-0.174
2028	-0.185
2029	0.159