Year	US Dollars
1996	23.47
1997	24.04
1998	24.45
1999	25.36
2000	26.61
2001	27.67
2002	28.8
2003	29.88
2004	30.72
2005	30.94
2006	32.3
2007	32.93
2009	35.51
2010	35.93
2011	37.78
2012	38.74
2013	39.88
2014	40.84
2015	41.32
2016	42.3