Year	Percent
1995	70.32
1996	69.16
1997	71.61
1998	71.93
1999	61.13
2000	62.93
2001	68.07
2002	70.68
2003	71.92
2004	71.25
2005	67.84
2006	68.34
2007	67.83
2008	73.02
2009	75.13
2010	75.2