Year	U.S. dollars (Billions)
1980	0.289
1981	0.370
1982	0.421
1983	0.475
1984	0.330
1985	0.485
1986	0.474
1987	0.401
1988	0.374
1989	0.449
1990	0.548
1991	0.772
1992	0.846
1993	0.653
1994	0.361
1995	0.778
1996	0.741
1997	0.704
1998	0.592
1999	0.580
2000	0.392
2001	0.413
2002	0.466
2003	0.553
2004	0.582
2005	0.640
2006	0.635
2007	0.753
2008	0.953
2009	0.889
2010	0.941
2011	1.157
2012	1.050
2013	1.110
2014	1.136
2015	1.153
2016	1.245
2017	1.469
2018	1.555
2019	1.487
2020	1.523
2021	1.725
2022	1.718
2023	1.969
2024	2.151
2025	2.321
2026	2.500
2027	2.694
2028	2.890
2029	3.081