Year	U.S. dollars (Billions)
1980	-3.555
1981	-4.328
1982	4.913
1983	-0.440
1984	-0.957
1985	-0.936
1986	-5.668
1987	-2.699
1988	-2.123
1989	-2.972
1990	-2.700
1991	-11.200
1992	-7.300
1993	-4.200
1994	5.000
1995	3.358
1996	5.232
1997	2.213
1998	-2.140
1999	6.589
2000	12.500
2001	5.985
2002	3.585
2003	0.816
2004	1.442
2005	15.392
2006	20.585
2007	32.594
2008	22.838
2009	9.477
2010	27.554
2011	58.507
2012	23.362
2013	25.105
2014	13.571
2015	1.237
2016	13.236
2017	14.915
2018	26.241
2019	-1.652
2020	-0.708
2021	11.144
2022	14.205
2023	17.755
2024	16.711
2025	16.532
2026	16.302
2027	17.029
2028	17.728
2029	18.440