Year	U.S. dollars (Billions)
2008	0.020
2009	0.028
2010	0.023
2011	0.019
2012	0.035
2013	0.049
2014	0.029
2015	-0.017
2016	0.004
2017	0.014
2018	0.010
2019	0.006
2020	0.003
2021	0.007
2022	-0.001
2023	0.005
2024	0.008
2025	-0.002
2026	-0.003
2027	-0.003
2028	-0.003
2029	-0.003