Year	US Dollars
1990	26430
1991	27560
1992	31220
1993	32650
1994	33950
1995	34660
1996	33810
1997	33520
1998	31450
1999	29900
2000	30870
2001	34410
2002	37090
2003	40560
2004	49750
2005	53620
2006	58810
2007	74960
2008	69530
2009	70380
2010	85790
2011	101000
2012	107980
2013	117970
2014	118020
2015	98320
2016	96570