Year	Percent
1995	67.77
1996	68.13
1997	72.02
1998	70.78
1999	71.16
2000	70.58
2001	67.83
2002	74.03
2003	73.44
2004	72.59
2005	71.63
2006	67.24
2007	63.69
2008	63.13
2009	61.25
2010	62.04