Year	current US$
1970	17030000.329017647
1971	20169999.832287434
1972	24290000.114589926
1973	25239999.44142997
1974	27020000.100135818
1975	38240000.18090012
1976	27680000.163614742
1977	25719999.931752667
1978	47959999.50915571
1979	49559999.268502034
1980	89459999.14407726
1981	93960001.02162366
1982	81689999.3568658
1983	78430000.35732988
1984	69890001.06975435
1985	76470000.56505196
1986	88000000.69290406
1987	110339999.16911128
1988	123000000.5662441
1989	122359999.49276452
1990	137420000.5084277
1991	132099999.4277954
1992	110979999.03559688
1993	100669999.78199595
1994	92359999.73118305
1995	100399999.90165237
1996	85280000.72576109
1997	103280001.80795783
1998	78859999.8336285
1999	72120000.06809825
2000	60209999.00996685
2001	50339999.81544908
2002	37749999.664723866
2003	34690000.05722047
2004	51080000.460147865
2005	58429999.94754793
2006	60650000.63180925
2007	62309999.64475632
2008	61689999.848604225
2009	61880000.74028968
2010	62659999.608993515
2011	51189999.554306276
2012	51602530.34825833
2013	46663812.08226085
2014	47350039.03880713
2015	38408669.768949024
2016	31045350.01516341
2017	25379275.619608954
2018	17430996.63220346
2019	21138010.96379758
2020	20063667.72949695
2021	22105754.95427474
2022	24028249.725699432