Year	U.S. dollars (Billions)
1980	-2.262
1981	-2.580
1982	-1.872
1983	-1.155
1984	-1.027
1985	-0.692
1986	-0.820
1987	-0.088
1988	0.094
1989	-0.494
1990	-0.372
1991	0.340
1992	0.545
1993	1.830
1994	1.496
1995	1.716
1996	2.025
1997	1.947
1998	0.328
1999	-0.114
2000	0.615
2001	0.195
2002	0.317
2003	0.810
2004	-0.190
2005	-7.505
2006	-12.430
2007	-17.587
2008	-17.227
2009	-11.022
2010	-2.859
2011	-4.057
2012	-7.629
2013	3.703
2014	2.783
2015	12.823
2016	-12.586
2017	1.648
2018	18.913
2019	-79.235
2020	-27.968
2021	70.458
2022	57.528
2023	53.856
2024	58.563
2025	56.582
2026	54.099
2027	51.200
2028	51.041
2029	50.561