Year	Percent
1995	65.93
1996	69.11
1997	71.47
1998	67.52
1999	67.07
2000	77.12
2001	69.62
2002	68.64
2003	69.12
2004	71.48
2005	66.62
2006	57.71
2007	54.89
2008	51.82
2009	52.52
2010	55.15