Year	current US$
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	3293.25035397294
1987	14788.4300571534
1988	19121.0238131729
1989	44818.7550626515
1990	52870.2108867103
1991	24723.0182310037
1992	24205.0757330154
1993	48332.0298981652
1994	128755.805537103
1995	223864.126701687
1996	336520.312189167
1997	153143.077081505
1998	76441.509112817
1999	81817.4067571734
2000	46429.6826484354
2001	36.4881713023877
2002	764.933421772094
2003	11172.4828163531
2004	16984.500241463
2005	9917.36254661285
2006	19381.8787574787
2007	11113.9446680342
2008	6268.80351488131
2009	38852.4580352906
2010	86920.4207304253
2011	319557.916536536
2012	350442.871389168
2013	1369674.05745666
2014	1164495.90266137
2015	576024.741258693
2016	342913.298280733
2017	410707.231845895
2018	438395.417312924
2019	510753.652758266
2020	352188.255313518
2021	305715.777311775