Year	U.S. dollars (Billions)
1981	2.711
1982	2.758
1983	2.525
1984	2.922
1985	3.158
1986	1.993
1987	2.265
1988	2.246
1989	2.153
1990	2.355
1991	2.466
1992	1.810
1993	1.225
1994	1.588
1995	1.154
1996	1.354
1997	1.212
1998	0.752
1999	1.545
2000	2.998
2001	1.951
2002	1.756
2003	2.484
2004	2.882
2005	4.033
2006	5.229
2007	4.828
2008	6.939
2009	3.977
2010	5.016
2011	6.430
2012	5.684
2013	3.778
2014	5.251
2015	2.157
2016	1.470
2017	1.984
2018	0.940
2019	0.894
2020	0.514
2021	1.570
2022	3.264
2023	2.875
2024	2.886
2025	3.012
2026	3.095
2027	2.961
2028	3.111
2029	3.308