Year	U.S. dollars (Billions)
1980	-0.112
1981	-0.104
1982	-0.188
1983	-0.232
1984	-0.238
1985	-0.170
1986	-0.127
1987	-0.138
1988	-0.226
1989	-0.269
1990	-0.294
1991	-0.328
1992	-0.223
1993	-0.218
1994	-0.256
1995	-0.100
1996	-0.243
1997	-0.038
1998	-0.049
1999	0.218
2000	0.366
2001	0.451
2002	0.232
2003	0.153
2004	0.196
2005	0.163
2006	0.192
2007	-0.014
2008	0.344
2009	0.536
2010	-0.378
2011	-0.181
2012	0.909
2013	0.635
2014	0.908
2015	1.067
2016	1.339
2017	-0.093
2018	-2.350
2019	-2.369
2020	-0.339
2021	-2.844
2022	-5.174
2023	-0.557
2024	0.643
2025	-0.979
2026	-1.176
2027	-1.313
2028	-1.382
2029	-1.468