Year	U.S. dollars (Billions)
1987	-0.024
1988	-0.017
1989	-0.021
1990	-0.019
1991	-0.041
1992	-0.011
1993	0.003
1995	-0.123
1996	-0.344
1997	-0.144
1998	-0.398
1999	-0.218
2000	-0.352
2001	-0.817
2002	-1.117
2003	-0.188
2004	0.454
2005	1.376
2006	1.940
2007	2.181
2008	1.557
2009	-1.468
2010	-3.303
2011	-1.212
2012	-0.252
2013	-0.526
2014	-0.925
2015	-2.339
2016	-2.921
2017	-0.953
2018	-0.357
2019	-0.857
2020	-0.078
2021	0.514
2022	0.287
2023	-0.138
2024	-0.286
2025	-0.293
2026	-0.532
2027	-0.683
2028	-0.894
2029	-0.968