Year	U.S. dollars (Billions)
1980	6.343
1981	7.113
1982	8.280
1983	7.898
1984	7.891
1985	7.503
1986	4.877
1987	4.880
1988	4.574
1989	4.397
1990	5.155
1991	5.399
1992	5.533
1993	4.656
1994	5.032
1995	5.421
1996	5.859
1997	5.837
1998	6.148
1999	6.926
2000	8.295
2001	8.960
2002	9.148
2003	11.464
2004	13.472
2005	16.170
2006	18.600
2007	21.937
2008	28.193
2009	19.520
2010	22.522
2011	25.789
2012	27.335
2013	28.710
2014	29.698
2015	27.027
2016	23.723
2017	24.040
2018	24.569
2019	23.776
2020	20.808
2021	24.496
2022	30.053
2023	28.142
2024	28.365
2025	29.505
2026	30.050
2027	30.829
2028	31.836
2029	32.845