Year	U.S. dollars (Billions)
1980	-0.151
1981	-0.304
1982	-0.145
1983	-0.079
1984	-0.059
1985	0.082
1986	0.109
1987	0.628
1988	0.194
1989	0.492
1990	-0.019
1991	0.303
1992	0.198
1993	0.427
1994	0.222
1995	0.300
1996	0.495
1997	0.721
1998	0.170
1999	0.583
2000	0.545
2001	0.595
2002	0.263
2003	0.717
2004	0.317
2005	1.598
2006	1.951
2007	1.654
2008	0.150
2009	-0.648
2010	-0.744
2011	-0.132
2012	-0.821
2013	0.647
2014	1.713
2015	0.301
2016	1.203
2017	0.900
2018	0.067
2019	-1.155
2020	-1.531
2021	-0.250
2022	0.606
2023	-0.072
2024	-0.251
2025	0.563
2026	0.237
2027	0.195
2028	0.235
2029	0.283