Year	constant 2010 US$
1977	21769987.2466243
1978	24839659.6973825
1979	18036701.8386151
1980	17072982.2096836
1981	13955174.4332027
1982	11647100.9935116
1983	11409805.1671027
1984	10708806.5287664
1985	10241599.034474
1986	10954689.7279165
1987	12545905.1658592
1988	13335210.0874898
1989	14029193.0544695
1990	14883050.801668
1991	15398258.9301629
1992	16071446.2471809
1993	16719857.5320549
1994	16510252.3001167
1995	15122524.2160658
1996	14808409.1758111
1997	15541464.3959552
1998	16200822.1823037
1999	16736525.0445881
2000	17292634.3478929
2001	16925048.1255383
2002	18958214.3706059
2003	20093857.5894244
2004	19700684.4829647
2005	22009675.5367917
2006	23264559.0412196
2007	23045944.3430472
2008	21463116.2676952
2009	18445981.1678616
2010	18757888.8888889
2011	21300450.354837
2012	21819260.4679323
2013	23029907.4931504
2014	19337873.2777143
2015	19853620.1722899
2016	10221221.4237455
2017	10368323.4836841
2018	10702171.9578316