Year	U.S. dollars (Billions)
1980	-0.276
1981	-0.181
1982	-0.233
1983	-0.062
1984	0.001
1985	-0.064
1986	-0.156
1987	-0.177
1988	-0.230
1989	-0.257
1990	-0.236
1991	-0.176
1992	-0.159
1993	-0.097
1994	-0.126
1995	-0.152
1996	-0.109
1997	-0.133
1998	-0.152
1999	-0.137
2000	-0.104
2001	-0.092
2002	-0.166
2003	-0.219
2004	-0.231
2005	-0.312
2006	-0.314
2007	-0.352
2008	-0.654
2009	-1.325
2010	-1.137
2011	-1.433
2012	-1.022
2013	-1.151
2014	-1.307
2015	-1.486
2016	-1.182
2017	-1.274
2018	-1.625
2019	-1.572
2020	-1.816
2021	-2.099
2022	-2.500
2023	-2.118
2024	-0.960
2025	-0.879
2026	-0.978
2027	-1.239
2028	-1.036
2029	-1.024