Year	U.S. dollars (Billions)
1980	3.589
1981	3.440
1982	3.813
1983	3.609
1984	3.752
1985	4.059
1986	3.970
1987	4.323
1988	4.598
1989	4.716
1990	4.868
1991	5.335
1992	5.635
1993	5.724
1994	5.974
1995	6.707
1996	7.385
1997	7.919
1998	8.490
1999	8.269
2000	8.385
2001	8.155
2002	7.917
2003	8.092
2004	8.785
2005	9.573
2006	11.520
2007	13.216
2008	16.792
2009	17.464
2010	19.786
2011	24.135
2012	27.282
2013	30.883
2014	33.237
2015	33.241
2016	34.189
2017	37.782
2018	40.581
2019	41.193
2020	36.897
2021	40.703
2022	44.315
2023	46.473
2024	49.334
2025	52.520
2026	55.752
2027	59.205
2028	62.871
2029	66.761