Year	U.S. dollars (Billions)
1990	0.028
1991	0.105
1992	0.050
1993	0.110
1994	0.085
1995	0.176
1996	0.116
1997	0.090
1998	0.162
1999	-0.028
2000	0.192
2001	0.011
2002	0.086
2003	0.266
2004	0.446
2005	0.329
2006	1.083
2007	0.748
2008	-0.009
2009	-0.317
2010	-0.448
2011	-0.858
2012	-1.119
2013	-0.992
2014	-1.173
2015	-1.559
2016	-1.769
2017	-0.570
2018	-0.486
2019	-0.221
2020	0.316
2021	-1.391
2022	-1.646
2023	-1.344
2024	-0.917
2025	-0.892
2026	-1.089
2027	-0.958
2028	-0.968
2029	-1.046