Year	U.S. dollars (Billions)
1980	4.196
1981	9.963
1982	4.106
1983	2.174
1984	-1.434
1985	-0.328
1986	-4.823
1987	-10.818
1988	-32.544
1989	-38.439
1990	-33.860
1991	-13.604
1992	-16.559
1993	-12.155
1994	-2.323
1995	-5.120
1996	-3.753
1997	-2.178
1998	-4.661
1999	-35.700
2000	-30.557
2001	-29.263
2002	-35.297
2003	-37.489
2004	-55.765
2005	-50.868
2006	-84.629
2007	-115.284
2008	-114.329
2009	-74.294
2010	-68.681
2011	-43.443
2012	-85.168
2013	-129.421
2014	-153.981
2015	-144.899
2016	-147.036
2017	-93.708
2018	-112.902
2019	-76.688
2020	-77.458
2021	-14.865
2022	-95.513
2023	-73.489
2024	-90.733
2025	-103.721
2026	-109.171
2027	-116.567
2028	-124.207
2029	-131.547