Year	U.S. dollars (Billions)
1980	-0.130
1981	-0.081
1982	-0.114
1983	-0.107
1984	-0.077
1985	-0.038
1986	0.011
1987	0.066
1988	0.095
1989	0.077
1990	0.051
1991	0.047
1992	-0.041
1993	-0.064
1994	0.002
1995	-0.030
1996	-0.052
1997	-0.003
1998	-0.093
1999	-0.033
2000	-0.046
2001	0.009
2002	0.033
2003	0.089
2004	0.071
2005	-0.103
2006	-0.197
2007	-0.065
2008	-0.231
2009	-0.416
2010	-0.388
2011	-0.282
2012	0.246
2013	0.499
2014	0.512
2015	0.527
2016	0.300
2017	0.275
2018	0.063
2019	0.175
2020	0.281
2021	0.127
2022	-0.129
2023	0.107
2024	0.108
2025	0.059
2026	0.038
2027	0.037
2028	0.012
2029	0.001