Year	U.S. dollars (Billions)
1980	0.131
1981	0.148
1982	0.164
1983	0.182
1984	0.208
1985	0.241
1986	0.290
1987	0.337
1988	0.399
1989	0.439
1990	0.459
1991	0.482
1992	0.499
1993	0.535
1994	0.589
1995	0.577
1996	0.634
1997	0.681
1998	0.728
1999	0.766
2000	0.826
2001	0.800
2002	0.814
2003	0.856
2004	0.920
2005	1.023
2006	1.158
2007	1.313
2008	1.370
2009	1.228
2010	1.149
2011	1.138
2012	1.200
2013	1.181
2014	1.250
2015	1.337
2016	1.437
2017	1.468
2018	1.605
2019	1.675
2020	1.416
2021	1.561
2022	1.758
2023	1.954
2024	2.127
2025	2.258
2026	2.367
2027	2.480
2028	2.600
2029	2.725