Year	U.S. dollars (Billions)
1980	0.184
1981	0.430
1982	0.426
1983	0.103
1984	0.218
1985	0.039
1986	-0.069
1987	-0.201
1988	0.192
1989	-0.193
1990	0.070
1991	-0.602
1992	-0.827
1993	-0.338
1994	-0.255
1995	0.237
1996	0.260
1997	-0.031
1998	-0.778
1999	-0.022
2000	0.846
2001	0.226
2002	-0.056
2003	0.197
2004	0.474
2005	1.476
2006	2.189
2007	2.908
2008	2.257
2009	0.560
2010	0.771
2011	2.524
2012	2.578
2013	2.410
2014	1.523
2015	-0.752
2016	-1.493
2017	-1.450
2018	-2.435
2019	-0.794
2020	-3.245
2021	2.602
2022	6.839
2023	2.833
2024	3.243
2025	2.582
2026	1.668
2027	0.885
2028	0.235
2029	0.304