Year	current US$
1979	26178771.924721487
1980	21434430.094300944
1981	21082595.13128231
1982	19601279.519374687
1983	27644158.196638823
1984	36259195.80771944
1985	34414139.12781047
1986	28419066.8310359
1987	26645668.14445284
1988	29743550.45678279
1989	29308353.871873975
1990	33068511.87425252
1991	31276862.46418338
1992	31774728.375899535
1993	33993798.373101056
1994	35702933.72277823
1995	38461881.52812837
1996	43152910.42705359
1997	42849745.40433244
1998	68453349.54025918
1999	66589192.33004068
2000	62465793.38499453
2001	60689892.47311828
2002	63722027.47571697
2003	71790324.91481017
2004	86134716.87986402
2005	87975895.61150584
2006	92199233.53252411
2007	108231848.68822452
2008	118232579.93525521
2009	114913849.32324821
2010	131075701.0880862
2011	160647522.2911151
2012	161673188.50357577
2013	163196446.042785
2014	180691241.24550164
2015	163869497.23177534
2016	169320119.84328187
2017	188071260.77388033
2018	194099759.45173147