Year	U.S. dollars (Billions)
1980	0.242
1981	-0.209
1982	-0.436
1983	-0.085
1984	0.074
1985	1.015
1986	-2.230
1987	0.141
1988	-1.900
1989	-1.033
1990	1.350
1991	2.390
1992	1.290
1993	0.810
1994	-1.839
1995	-2.237
1996	1.248
1997	3.450
1998	-0.910
1999	0.020
2000	9.142
2001	7.060
2002	4.359
2003	8.808
2004	11.116
2005	21.183
2006	28.950
2007	30.600
2008	34.449
2009	0.411
2010	12.157
2011	19.802
2012	12.290
2013	0.835
2014	-9.436
2015	-27.290
2016	-26.473
2017	-22.331
2018	-16.884
2019	-16.911
2020	-18.681
2021	-4.512
2022	19.064
2023	5.277
2024	0.362
2025	-4.175
2026	-7.255
2027	-8.587
2028	-10.157
2029	-11.567