Year	U.S. dollars (Billions)
1980	-0.083
1981	0.025
1982	-0.070
1983	-0.072
1984	0.104
1985	0.005
1986	-0.043
1987	-0.112
1988	-0.195
1989	-0.260
1990	-0.263
1991	-0.170
1992	-0.100
1993	-0.171
1994	-0.174
1995	-0.281
1996	-0.212
1997	-0.316
1998	-0.364
1999	-0.293
2000	-0.359
2001	-0.291
2002	-0.152
2003	-0.038
2004	-0.002
2005	0.049
2006	-0.318
2007	-0.563
2008	-1.224
2009	-1.048
2010	-1.610
2011	-2.087
2012	-1.656
2013	-1.751
2014	-2.166
2015	-1.649
2016	-0.796
2017	-1.502
2018	-2.085
2019	-2.632
2020	-3.598
2021	-3.972
2022	-4.172
2023	-3.972
2024	-4.090
2025	-4.686
2026	-3.866
2027	-2.271
2028	-3.616
2029	-4.520