Year	U.S. dollars (Billions)
1980	-0.565
1981	-0.739
1982	-0.616
1983	-0.685
1984	-0.980
1985	-0.943
1986	-1.480
1987	-1.388
1988	-0.769
1989	-0.584
1990	-0.259
1991	-0.133
1992	-0.008
1993	-1.395
1994	-1.872
1995	-2.648
1996	-2.020
1997	-1.528
1998	-1.373
1999	1.177
2000	0.850
2001	0.920
2002	-0.627
2003	-1.931
2004	-1.591
2005	-0.560
2006	-0.164
2007	-6.992
2008	-10.787
2009	-6.608
2010	-4.276
2011	0.233
2012	9.267
2013	7.744
2014	8.617
2015	-2.039
2016	0.625
2017	-1.651
2018	5.769
2019	12.477
2020	15.060
2021	-8.150
2022	-0.090
2023	22.184
2024	10.610
2025	10.075
2026	9.227
2027	8.109
2028	5.642
2029	5.931