Year	U.S. dollars (Billions)
1990	-0.130
1991	-0.083
1992	-0.073
1993	-0.095
1994	-0.023
1995	0.007
1996	-0.003
1997	-0.032
1998	-0.018
1999	-0.030
2000	-0.098
2001	-0.131
2002	0.035
2003	-0.175
2004	-0.517
2005	-0.877
2006	0.148
2007	-0.406
2008	-0.479
2009	-0.492
2010	-0.357
2011	-0.259
2012	-1.264
2013	-1.262
2014	-1.471
2015	-0.956
2016	-0.707
2017	-0.681
2018	-0.976
2019	-0.831
2020	-0.576
2021	-0.774
2022	-1.519
2023	-1.184
2024	-1.240
2025	-1.050
2026	-0.849
2027	-1.050
2028	-0.965
2029	-0.976