Year	Percent
1995	63.01
1996	60.42
1997	62.35
1998	66.71
1999	63.58
2000	55.32
2001	57.93
2002	66.48
2003	51.14
2004	62.25
2005	56.88
2006	65.57
2007	74.2
2008	75.85
2009	77.63
2010	72.55