Year	current US$
1978	8355662.79292035
1979	7482330.901445384
1980	5533769.658545917
1981	7840591.11828686
1982	7791143.394163286
1983	7559357.305982351
1984	11399546.650823725
1985	6618502.054969115
1986	4741392.564309273
1987	5619739.808707586
1988	9034243.086221822
1989	7115310.252989688
1990	4432277.408421327
1991	12746503.229585685
1992	14551337.79067718
1993	13802497.007942552
1994	16093133.911070071
1995	16055426.368369047
1996	17346616.969111715
1997	16148228.41366207
1998	15932060.498998635
1999	17372173.295912772
2000	13423549.144348968
2001	12871500.670824364
2002	15634455.32698419
2003	21157081.393644523
2004	24980069.895098515
2005	22956028.875738557
2006	24298385.584646676
2007	30734382.53092701
2008	34828523.92847377
2009	35238330.69851636
2010	37570849.7567786
2011	45561821.338204764
2012	46296907.955158465
2013	42663125.5894957
2014	42671244.669238105
2015	36921320.121103756
2016	47016311.159414046
2017	57389109.704634875
2018	49735507.45211489
2019	45378375.27651405
2020	47022130.83194019
2021	52562637.317025766