Year	Percent
1995	71.68
1996	70.37
1997	69.76
1998	72.47
1999	70.93
2000	67.4
2001	62.67
2002	56.46
2003	59.44
2004	57
2005	54.37
2006	57.4
2007	58.38
2008	56.63
2009	58.09
2010	60.84