Year	U.S. dollars (Billions)
1980	-0.260
1981	-0.146
1982	-0.112
1983	-0.131
1984	-0.042
1985	-0.126
1986	-0.085
1987	-0.061
1988	-0.087
1989	-0.051
1990	-0.086
1991	-0.228
1992	-0.285
1993	-0.166
1994	-0.181
1995	-0.078
1996	-0.147
1997	-0.276
1998	-0.004
1999	-0.158
2000	-0.073
2001	-0.060
2002	-0.473
2003	-0.331
2004	-0.363
2005	-0.486
2006	-0.697
2007	-0.364
2008	-0.803
2009	-0.632
2010	-0.597
2011	-0.688
2012	-0.584
2013	-0.497
2014	-0.596
2015	-1.101
2016	-1.013
2017	-1.389
2018	-1.190
2019	-1.391
2020	-1.631
2021	-1.758
2022	-0.399
2023	-0.911
2024	-0.802
2025	-1.064
2026	-0.912
2027	-0.961
2028	-0.925
2029	-0.935