Year	U.S. dollars (Billions)
1980	-4.331
1981	-2.778
1982	-3.422
1983	-0.743
1984	0.725
1985	-1.162
1986	0.927
1987	0.284
1988	-0.490
1989	-3.102
1990	-6.268
1991	-4.696
1992	-7.469
1993	-2.659
1994	2.294
1995	8.355
1996	9.514
1997	10.190
1998	9.484
1999	10.469
2000	10.019
2001	11.163
2002	11.636
2003	19.403
2004	22.833
2005	23.337
2006	34.168
2007	39.549
2008	39.917
2009	25.752
2010	28.942
2011	31.185
2012	30.214
2013	30.688
2014	24.516
2015	16.159
2016	11.504
2017	14.914
2018	13.770
2019	28.483
2020	32.084
2021	45.181
2022	34.516
2023	36.922
2024	37.094
2025	34.206
2026	32.973
2027	31.465
2028	30.595
2029	31.902