Year	U.S. dollars (Billions)
1995	-0.020
1996	-0.042
1997	-0.064
1998	-0.055
1999	-0.046
2000	-0.034
2001	-0.042
2002	-0.024
2003	-0.015
2004	-0.044
2005	-0.025
2006	-0.039
2007	-0.027
2008	-0.050
2009	-0.059
2010	-0.052
2011	-0.060
2012	-0.044
2013	-0.032
2014	0.020
2015	0.014
2016	0.024
2017	0.038
2018	0.085
2019	0.063
2020	-0.022
2021	0.009
2022	0.037
2023	0.015
2024	0.004
2025	0.004
2026	0.003
2027	0.002
2028	0.001
2029	-0.003