Year	US Dollars
1995	7.39
1996	7.85
1997	8.02
1998	8.04
1999	8.52
2000	9.15
2001	10.62
2002	11.16
2003	12.26
2004	12.78
2005	13.42
2006	14.03
2007	15.3
2009	16.58
2010	16.73
2011	17.44
2012	18.88
2013	19.69
2014	20.31
2015	20.54
2016	21.16