Year	US Dollars
1997	17760
1998	19740
1999	22510
2000	23200
2001	23680
2002	24750
2003	28660
2004	35230
2005	40840
2006	45600
2007	64530
2008	73290
2009	75560
2010	78300
2011	81360
2012	85910
2013	88840
2014	89970
2015	82650