Year	US Dollars
1996	8.48
1997	8.39
1998	8.92
1999	9.91
2000	9.86
2001	10.79
2002	11.52
2003	11.87
2004	12.16
2005	12.44
2006	13.2
2007	14.33
2009	13.02
2010	13.97
2011	14.87
2012	18.32
2013	19.24
2014	19.75
2015	20.27
2016	20.98