Year	U.S. dollars (Billions)
1980	0.242
1981	0.212
1982	0.201
1983	0.195
1984	0.188
1985	0.191
1986	0.257
1987	0.312
1988	0.336
1989	0.328
1990	0.401
1991	0.400
1992	0.436
1993	0.427
1994	0.314
1995	0.392
1996	0.392
1997	0.362
1998	0.363
1999	0.372
2000	0.339
2001	0.373
2002	0.427
2003	0.547
2004	0.622
2005	0.656
2006	0.689
2007	0.796
2008	0.916
2009	0.904
2010	0.909
2011	1.023
2012	1.016
2013	1.116
2014	1.150
2015	0.966
2016	1.013
2017	1.077
2018	1.179
2019	1.188
2020	1.218
2021	1.273
2022	1.225
2023	1.340
2024	1.422
2025	1.516
2026	1.617
2027	1.716
2028	1.818
2029	1.924