Year	U.S. dollars (Billions)
1980	-0.163
1981	-0.573
1982	-0.399
1983	-0.224
1984	-0.377
1985	-0.246
1986	-0.018
1987	-0.443
1988	-0.414
1989	-0.367
1990	-0.213
1991	-0.184
1992	-0.706
1993	-0.702
1994	-0.625
1995	-0.572
1996	-0.452
1997	-0.634
1998	-1.039
1999	-1.026
2000	-1.050
2001	-1.211
2002	-1.262
2003	-1.020
2004	-1.165
2005	-1.241
2006	-1.524
2007	-1.786
2008	-1.554
2009	0.072
2010	-0.767
2011	-1.580
2012	-1.847
2013	-2.239
2014	-1.909
2015	-0.774
2016	0.637
2017	0.857
2018	0.650
2019	1.822
2020	3.924
2021	1.890
2022	1.243
2023	2.934
2024	2.690
2025	2.258
2026	1.895
2027	1.434
2028	0.881
2029	0.858