Year	current US$
1977	6699999.924749135
1980	12759999.979287382
1981	11149999.97243285
1982	10690000.111237166
1983	10650000.007823111
1984	8729999.963194126
1985	9639999.944716696
1986	7919999.990612273
1987	9019999.83936548
1988	11319999.974220986
1989	13600000.297650691
1990	13960000.025108458
1991	10350000.066682704
1992	8460000.075399892
1993	11350000.018253911
1994	17009999.95693564
1995	23020000.061020266
1996	22489999.655634176
1997	18370000.123977665
1998	18899999.845772978
1999	17199999.788776025
2000	11890000.153332947
2001	20800000.13858081
2002	19349999.850615863
2003	16969999.978318814
2004	19930000.036954887
2005	18239999.681711208
2006	22460000.142455097
2007	24270000.249147404
2008	28459999.97854233
2009	31170000.10609626
2010	28050000.22053718
2011	26289999.72343445
2012	29418970.048427567
2013	29091446.93613054
2014	27553906.083107002
2015	26431079.804897305
2016	21581113.725900646
2017	19162595.391273506
2018	20504649.75833893
2019	30855266.451835632
2020	33463659.763336163
2021	36229901.134967804
2022	42090849.578380585