Year	current US$
1977	11650000.1735985
1979	0
1980	20700000.2861023
1981	13969999.8293072
1982	20040000.2188981
1983	25600000.0424683
1984	32630000.9936094
1985	21019999.7872114
1986	14929999.548941901
1987	13619999.8557568
1988	16250000.320375001
1989	18089999.6906519
1990	27729999.691247903
1991	19170000.389218297
1992	18079999.7746944
1993	14610000.3421307
1994	27749999.800697003
1995	30569999.897852503
1996	36770000.2193451
1997	24880000.660195902
1998	29470000.7140636
1999	25580000.10252
2000	19090000.271797203
2001	36500000.2384186
2002	42279999.7329712
2003	43839999.422431
2004	29740000.1883507
2005	37139999.9856949
2006	37460000.038147
2007	37979999.840259604
2008	34550000.1907349
2009	39480000.3767014
2010	44300000.6377697
2011	43880000.7402897
2012	40116598.4869003
2013	34656486.2728119
2014	37388472.4974632
2015	37078668.3261395
2016	30414829.2541504
2017	20908214.285969697
2018	20430310.010909997
2019	26537316.471338302
2020	29676019.4301605
2021	31605208.158493
2022	34109480.14259339