Year	U.S. dollars (Billions)
1980	-2.076
1981	-2.571
1982	-1.003
1983	-2.873
1984	-2.109
1985	-1.537
1986	0.247
1987	-0.366
1988	-1.654
1989	-2.498
1990	-7.281
1991	-7.571
1992	-6.303
1993	-6.355
1994	-8.059
1995	-13.582
1996	-14.691
1997	-3.021
1998	14.242
1999	12.428
2000	9.313
2001	5.101
2002	4.654
2003	4.772
2004	2.759
2005	-7.642
2006	2.315
2007	15.584
2008	0.931
2009	22.189
2010	11.486
2011	9.427
2012	-4.899
2013	-8.833
2014	11.643
2015	27.753
2016	43.438
2017	43.952
2018	28.479
2019	38.256
2020	20.933
2021	-10.269
2022	-15.742
2023	6.572
2024	9.063
2025	11.427
2026	12.927
2027	16.182
2028	18.574
2029	20.901