Year	current US$
1977	12720000.0490993
1979	0
1980	24059999.7472018
1981	17080000.0950694
1982	14190000.139176799
1983	14340000.089258
1984	15159999.916329999
1985	16560000.1234561
1986	11859999.936074
1987	12559999.7583777
1988	16729999.769479001
1989	19199999.9284744
1990	18170000.2308935
1991	16499999.9627471
1992	14110000.1893938
1993	14829999.8845905
1994	27419999.919831797
1995	29810000.1197308
1996	24040000.0233203
1997	27830000.0596792
1998	23300000.0081956
1999	18250000.1695007
2000	13880000.1479685
2001	21019999.9734759
2002	46080000.0391901
2003	30490000.2665818
2004	18759999.990463298
2005	18289999.7830391
2006	19120000.0345707
2007	18859999.716281902
2008	25889999.628066998
2009	31170000.0762939
2010	35670000.3147125
2011	29520000.1597404
2012	31575861.0208286
2013	31187192.3955623
2014	30794219.4342613
2015	26228668.391704597
2016	20118749.096989598
2017	17866113.118827302
2018	18609909.9814892
2019	34626612.0970249
2020	35104429.692030005
2021	36495983.6304188
2022	28453489.899635315