Year	constant 2010 US$
1977	49898959.1236774
1978	43049295.5054119
1979	45945340.6765538
1980	48678564.993662
1981	52641158.2372486
1982	45693133.9183336
1983	43838313.2894242
1984	49797709.6515375
1985	44949590.0329297
1986	42442621.4265152
1987	45347900.3566338
1988	45898672.6279208
1989	47935288.5946163
1990	47046229.6948962
1991	45943887.158118
1992	44699649.3996542
1993	42840964.2220078
1994	40211479.9632227
1995	42965899.4285242
1996	39585789.1872483
1997	39203839.7742144
1998	38698132.2569996
1999	42510036.1067617
2000	41580977.6460885
2001	40493943.9340307
2002	41738222.2822302
2003	44187285.165783
2004	40587909.1722001
2005	22824420.1846199
2006	29790836.5245799
2007	30281688.1985246
2008	33206787.5024879
2009	37233005.1568004
2010	34797296.2962963
2011	34252216.7354426
2012	35669529.1269751
2013	38666715.8015599
2014	53590912.1864684
2015	71736878.2536469
2016	64186132.0784013
2017	54258816.2875815
2018	52902672.6277645