Year	U.S. dollars (Billions)
1980	-0.903
1981	-1.156
1982	-1.710
1983	-0.978
1984	-1.978
1985	-1.491
1986	-1.540
1987	-1.486
1988	-0.150
1989	-1.326
1990	-1.307
1991	-1.040
1992	-1.526
1993	-1.485
1994	-1.669
1995	-2.460
1996	-3.262
1997	-3.584
1998	-1.580
1999	-2.946
2000	-1.809
2001	-0.437
2002	-1.320
2003	-2.046
2004	-4.668
2005	-8.089
2006	-7.889
2007	-9.243
2008	-10.508
2009	-2.650
2010	-3.327
2011	-4.671
2012	-6.885
2013	-5.934
2014	-6.267
2015	-4.941
2016	-3.749
2017	-5.786
2018	-8.802
2019	-5.893
2020	-2.057
2021	-14.540
2022	-21.270
2023	-17.083
2024	-15.525
2025	-14.273
2026	-13.314
2027	-12.727
2028	-12.315
2029	-11.682