Year	US Dollars
1992	11670
1993	12030
1994	12640
1995	13600
1996	14340
1997	14490
1998	14670
1999	15020
2000	15850
2001	17050
2002	17510
2003	18720
2004	19820
2005	20920
2006	22300
2007	24400
2008	25980
2009	25600
2010	25550
2011	26620
2012	27250
2013	28670
2014	30080
2015	31210
2016	32530
2017	34450