Year	current US$
1985	8542493.82
1986	6998269.558
1987	8797072.411
1988	5940382.481
1989	5376050.472
1990	5313700.53988559
1991	4363333.85518268
1992	6821804.16957375
1993	5997199.11030563
1994	3930143.96675407
1995	4496361.47062651
1996	4508720.16207169
1997	2332902.10278108
1998	2158494.30226737
1999	2087967.17311745
2000	2463668.23618653
2001	2355623.71038835
2002	2825143.54476098
2003	3267998.00484011
2004	330638.568444
2005	193606.158167478
2006	206185.857041694
2007	225443.049144692
2008	241799.963312528
2009	1114227.94105194
2010	4957959.18201529
2011	6163321.19200048
2012	5235126.8994185
2013	6978499.11232411
2014	14846058.0251117
2015	21041437.1582556
2016	19085453.3147457
2017	15722808.1235125
2018	19331789.2465233