Year	Percent
1995	79.1
1996	76.8
1997	73.67
1998	69.17
1999	66.23
2000	65.46
2001	68.92
2002	67.73
2003	66.94
2004	71.32
2005	68.42
2006	63.03
2007	64.05
2008	62.95
2009	58.6
2010	56.65