Year	current US$
1978	921979158.9276756
1979	1156957963.4827695
1980	2047003554.3734732
1981	1886421296.877654
1982	1687855891.1116467
1983	1411828788.6517491
1984	1555692023.670307
1985	1240008738.428747
1986	520493580.5385051
1987	415989321.6238165
1988	820988630.0308616
1989	933267256.6661115
1990	1443557952.8333066
1991	1554984602.227853
1992	1080775583.0886855
1993	764708586.3695598
1994	1221222874.4240007
1995	1620674153.1342144
1996	2024785327.302741
1997	2207821092.0962286
1998	1131866690.2508774
1999	1506681604.0057504
2000	2116382192.8332481
2001	1699879980.118802
2002	1853929599.3219516
2003	2131243864.31506
2004	2495919110.7337756
2005	4276610092.8972745
2007	4989828309.814255
2008	6912339526.758451
2009	4176510365.45885
2010	5915554085.385666
2011	7969045504.918244
2012	7536167649.505269
2013	7092125475.029371
2014	7716045794.335579
2015	5519948627.233296