Year	current US$
1977	6036792.19065635
1978	7012348.43309883
1979	9221903.12638476
1980	11621236.2405305
1981	13361340.1207972
1982	14916870.6213556
1983	16415918.3226285
1984	18559458.3686459
1985	23368492.0489197
1986	28301330.9225303
1987	33462548.1926335
1988	39039363.9117715
1989	44035937.8147019
1990	45866160.0253485
1991	48712416.1731007
1992	49135829.604219
1993	52642527.2608339
1994	58167474.1132552
1995	62319040.8030872
1996	69311858.7452042
1997	76062912.1703768
1998	81816894.4893347
1999	87675588.4365032
2000	92937990.9408713
2001	84217373.6563442
2002	84818162.8734307
2003	89711250.1325133
2004	93541273.6286815
2005	105557811.390632
2006	119224446.148417
2007	140500113.308957
2008	144974676.015976
2009	130364727.333145
2010	119897821.412249
2011	114118500.343814
2012	121189959.793616
2013	119083098.647079
2014	125093681.499451
2015	141667546.325227
2016	155012171.153913
2017	157909554.07763
2018	177646208.788355
2019	186332333.904735
2020	155461780.736036
2021	167463336.723239