Year	U.S. dollars (Billions)
1980	0.202
1981	-0.122
1982	-0.051
1983	0.060
1984	-0.041
1985	-0.029
1986	0.117
1987	0.136
1988	0.026
1989	-0.194
1990	-0.152
1991	-0.167
1992	-0.109
1993	-0.082
1994	-0.018
1995	-0.262
1996	-0.169
1997	-0.098
1998	-0.091
1999	-0.239
2000	-0.431
2001	-0.150
2002	-0.405
2003	-0.702
2004	-0.642
2005	-0.622
2006	-0.766
2007	-1.217
2008	-1.532
2009	-0.312
2010	-0.533
2011	-1.112
2012	-1.240
2013	-1.518
2014	-1.214
2015	-0.754
2016	-0.550
2017	-0.465
2018	-0.859
2019	-0.113
2020	0.403
2021	-1.272
2022	-2.146
2023	-0.466
2024	-0.903
2025	-1.011
2026	-1.117
2027	-1.184
2028	-1.292
2029	-1.320