Year	U.S. dollars (Billions)
1980	-5.300
1981	-5.113
1982	-4.704
1983	-2.455
1984	2.086
1985	2.088
1986	3.677
1987	-0.037
1988	-3.685
1989	-11.508
1990	-18.054
1991	-20.055
1992	-21.424
1993	-10.509
1994	-11.496
1995	-7.680
1996	-5.500
1997	-4.286
1998	-10.421
1999	-20.587
2000	-25.801
2001	-27.470
2002	-26.417
2003	-35.229
2004	-58.579
2005	-83.740
2006	-111.570
2007	-139.047
2008	-145.274
2009	-60.907
2010	-52.028
2011	-40.321
2012	1.139
2013	27.624
2014	23.307
2015	24.223
2016	39.140
2017	36.373
2018	26.715
2019	29.372
2020	7.887
2021	11.009
2022	8.682
2023	41.105
2024	41.700
2025	40.379
2026	34.403
2027	33.590
2028	33.160
2029	33.910