Year	U.S. dollars (Billions)
1980	-0.027
1981	-0.126
1982	-0.042
1983	-0.052
1984	0.011
1985	0.005
1986	-0.016
1987	-0.054
1988	0.002
1989	-0.003
1990	-0.038
1991	-0.024
1992	0.145
1993	0.069
1994	0.140
1995	0.058
1996	0.089
1997	-0.035
1998	-0.086
1999	-0.136
2000	-0.112
2001	-0.114
2002	-0.162
2003	-0.119
2004	-0.361
2005	-0.401
2006	-0.442
2007	-0.226
2008	-0.461
2009	-0.269
2010	-0.209
2011	-0.550
2012	-0.391
2013	-0.391
2014	-0.433
2015	-0.289
2016	-0.206
2017	-0.189
2018	-0.201
2019	-0.142
2020	-0.282
2021	-0.542
2022	-0.625
2023	-0.520
2024	-0.480
2025	-0.451
2026	-0.422
2027	-0.433
2028	-0.434
2029	-0.446