Year	U.S. dollars (Billions)
1980	-0.879
1981	-1.364
1982	-2.258
1983	-2.369
1984	-1.573
1985	0.991
1986	1.280
1987	-1.406
1988	-0.832
1989	0.214
1990	0.169
1991	-1.273
1992	-0.870
1993	-2.481
1994	-3.409
1995	-4.964
1996	-5.352
1997	-3.643
1998	-1.171
1999	-1.538
2000	-1.990
2001	-1.930
2002	-1.082
2003	0.765
2004	2.033
2005	4.360
2006	6.291
2007	5.619
2008	2.211
2009	6.751
2010	8.096
2011	4.135
2012	1.004
2013	8.876
2014	13.284
2015	15.857
2016	12.109
2017	13.061
2018	11.287
2019	12.761
2020	20.044
2021	19.131
2022	20.362
2023	23.961
2024	29.666
2025	24.134
2026	21.889
2027	22.910
2028	23.579
2029	24.176