Year	U.S. dollars (Billions)
1980	-3.865
1981	-3.042
1982	0.703
1983	0.276
1984	-0.178
1985	-0.158
1986	0.204
1987	-0.263
1988	-0.242
1989	0.248
1990	1.166
1991	0.061
1992	-0.753
1993	-1.013
1994	-2.992
1995	-6.900
1996	-6.736
1997	-5.424
1998	-4.048
1999	-4.917
2000	-1.393
2001	-1.573
2002	4.504
2003	4.060
2004	6.255
2005	7.143
2006	11.080
2007	14.800
2008	19.397
2009	10.420
2010	11.207
2011	7.038
2012	6.074
2013	8.359
2014	10.952
2015	6.591
2016	10.780
2017	5.732
2018	4.117
2019	10.603
2020	14.962
2021	7.893
2022	-1.372
2023	9.441
2024	11.332
2025	11.782
2026	12.128
2027	11.895
2028	11.896
2029	12.180