Year	U.S. dollars (Billions)
1980	3.968
1981	4.044
1982	4.267
1983	4.477
1984	4.915
1985	5.278
1986	5.678
1987	6.191
1988	6.877
1989	7.877
1990	4.923
1991	4.649
1992	4.944
1993	4.961
1994	4.642
1995	5.415
1996	5.217
1997	5.736
1998	6.366
1999	6.417
2000	7.104
2001	7.653
2002	7.858
2003	8.230
2004	8.868
2005	9.756
2006	10.917
2007	12.361
2008	13.887
2009	14.587
2010	15.839
2011	17.711
2012	18.523
2013	18.494
2014	19.753
2015	20.978
2016	21.712
2017	23.138
2018	24.067
2019	25.091
2020	23.826
2021	28.490
2022	31.716
2023	34.886
2024	37.355
2025	39.624
2026	41.962
2027	44.462
2028	47.107
2029	49.922