Year	U.S. dollars (Billions)
1980	0.032
1981	0.030
1982	0.035
1983	0.040
1984	0.044
1985	0.074
1986	0.091
1987	0.111
1988	0.119
1989	0.105
1990	0.133
1991	0.132
1992	0.160
1993	0.162
1994	0.120
1995	0.169
1996	0.276
1997	0.526
1998	0.440
1999	0.738
2000	1.159
2001	1.674
2002	2.071
2003	3.768
2004	5.954
2005	8.187
2006	10.095
2007	13.089
2008	19.830
2009	15.088
2010	16.314
2011	21.357
2012	22.388
2013	21.949
2014	21.765
2015	13.185
2016	11.241
2017	12.201
2018	13.097
2019	11.364
2020	9.894
2021	12.269
2022	11.767
2023	10.284
2024	10.708
2025	10.734
2026	10.926
2027	11.431
2028	11.831
2029	12.443