Year	U.S. dollars (Billions)
2001	0.008
2002	0.004
2003	-0.012
2004	-0.004
2005	-0.002
2006	0.007
2007	-0.005
2008	-0.008
2009	-0.020
2010	-0.020
2011	-0.034
2012	-0.012
2013	0.001
2015	-0.012
2016	0.012
2017	0.001
2018	0.029
2019	-0.012
2020	0.008
2021	0.015
2022	0.003
2023	0.002
2024	-0.001
2025	-0.003
2026	-0.004
2027	-0.004
2028	-0.004
2029	-0.004