Year	U.S. dollars (Billions)
1980	2.900
1981	-0.600
1982	-5.400
1983	-6.700
1984	-2.300
1985	-2.100
1986	-4.300
1987	-2.400
1988	-2.100
1989	-1.700
1990	-3.200
1991	-4.400
1992	-3.100
1993	-2.300
1994	-3.000
1995	-6.800
1996	-7.300
1997	-3.800
1998	4.000
1999	5.752
2000	7.990
2001	6.900
2002	7.822
2003	8.107
2004	5.258
2005	1.595
2006	9.542
2007	6.795
2008	0.126
2009	10.628
2010	5.303
2011	1.685
2012	-24.418
2013	-29.109
2014	-27.510
2015	-17.518
2016	-16.953
2017	-16.196
2018	-30.633
2019	-30.279
2020	-4.433
2021	3.511
2022	13.215
2023	-1.567
2024	-13.161
2025	-20.520
2026	-23.067
2027	-23.600
2028	-25.524
2029	-29.254