Year	US Dollars
1982	19100
1983	17730
1984	17960
1985	18060
1986	20340
1987	25630
1988	33620
1989	35220
1990	36900
1991	37510
1992	40880
1993	40780
1994	41860
1995	45400
1996	48360
1997	48110
1998	44990
1999	43150
2000	43460
2001	40940
2002	39710
2003	45560
2004	53790
2005	61540
2006	63830
2007	62580
2008	62940
2009	70220
2010	77360
2011	79200
2012	84500
2013	88740
2014	86560
2015	85780
2016	82080
2017	80560