Year	U.S. dollars (Billions)
1980	-0.117
1981	-0.434
1982	-0.539
1983	-0.299
1984	-0.245
1985	-0.254
1986	-0.083
1987	-0.141
1988	-0.061
1989	-0.324
1990	-0.312
1991	-0.240
1992	0.029
1993	-0.184
1994	0.082
1995	-0.099
1996	-0.143
1997	-0.332
1998	-0.334
1999	-0.216
2000	-0.367
2001	-0.759
2002	-1.074
2003	-0.773
2004	-0.502
2005	-1.071
2006	-1.183
2007	-2.030
2008	-2.794
2009	-1.128
2010	-0.935
2011	-1.965
2012	-1.440
2013	-1.357
2014	-1.114
2015	-0.430
2016	-0.043
2017	-0.397
2018	-0.235
2019	-0.303
2020	-0.157
2021	0.149
2022	-0.130
2023	0.281
2024	0.059
2025	-0.183
2026	-0.353
2027	-0.428
2028	-0.447
2029	-0.457