Year	U.S. dollars (Billions)
1980	8.364
1981	8.223
1982	5.631
1983	3.704
1984	5.641
1985	3.908
1986	1.658
1987	2.048
1988	1.642
1989	2.362
1990	-0.664
1991	-0.870
1992	-1.066
1993	-1.256
1994	-1.140
1995	-1.894
1996	-2.116
1997	-3.079
1998	-2.161
1999	0.092
2000	1.659
2001	4.152
2002	3.824
2003	5.754
2004	7.552
2005	7.482
2006	9.459
2007	11.458
2008	26.595
2009	6.389
2010	23.952
2011	52.124
2012	62.000
2013	60.461
2014	49.410
2015	13.751
2016	-8.270
2017	6.426
2018	16.652
2019	4.260
2020	-2.986
2021	26.319
2022	63.118
2023	43.867
2024	38.083
2025	33.155
2026	30.976
2027	36.661
2028	36.241
2029	31.739