Year	Percent
1995	71.01
1996	70.85
1997	71.14
1998	71.02
1999	70.48
2000	69.06
2001	70.49
2002	68.6
2003	72.97
2004	71.92
2005	69.22
2006	68.05
2007	69.23
2008	70.41
2009	71.29
2010	67.17