Year	U.S. dollars (Billions)
1980	-0.083
1981	-0.067
1982	-0.127
1983	-0.133
1984	-0.118
1985	-0.041
1986	-0.036
1987	-0.095
1988	-0.070
1989	-0.011
1990	-0.069
1991	-0.033
1992	-0.060
1993	-0.028
1994	-0.017
1995	0.010
1996	-0.040
1997	0.006
1998	-0.044
1999	-0.039
2000	-0.061
2001	-0.031
2002	-0.104
2003	-0.110
2004	-0.060
2005	-0.052
2006	-0.271
2007	-0.440
2008	-0.158
2009	-0.112
2010	-0.249
2011	-0.324
2012	-0.434
2013	-0.506
2014	-0.423
2015	-0.358
2016	-0.327
2017	-0.372
2018	-0.346
2019	-0.348
2020	-0.299
2021	-0.390
2022	-0.634
2023	-0.562
2024	-0.532
2025	-0.505
2026	-0.516
2027	-0.534
2028	-0.539
2029	-0.573