Year	Percent
1995	60.62
1996	62.05
1997	65.28
1998	62.16
1999	49.42
2000	51.26
2001	56.94
2002	63.85
2003	61.61
2004	57.28
2005	54.86
2006	60.71
2007	55.69
2008	59.5
2009	58.65
2010	60.28