Year	current US$
1981	2710000.03814697
1982	2279999.97138977
1983	4699999.80926514
1984	5969999.79019165
1985	6300000.19073486
1986	9909999.84741211
1987	46939998.626709
1988	133990005.493164
1989	179899993.89648402
1990	88010002.1362305
1991	138460006.71386698
1992	153389999.38964802
1993	102550003.05175799
1994	97660003.6621094
1995	91169998.1689453
1996	97190002.44140631
1997	50110000.6103516
1998	29760000.2288818
1999	46169998.1689453
2000	45990001.6784668
2001	42799999.237060495
2002	77190002.44140631
2003	74290000.9155273
2004	102800003.05175799
2005	125199996.94824201
2006	142800003.05175802
2007	132300003.051758
2008	207509994.506836
2009	364350006.10351604
2010	316690002.441406
2011	290970001.220703
2012	288130004.88281304
2013	148740005.493164
2014	91790000.9155273
2015	68559997.55859381
2016	58799999.237060495
2017	64449996.9482422
2018	-32639999.3896484
2019	67480003.3569336
2020	-48599998.4741211