Year	Percent
1995	73.96
1996	69.6
1997	71.66
1998	69.88
1999	66.33
2000	60.93
2001	58.39
2002	61.26
2003	62.12
2004	60.74
2005	60.93
2006	56.95
2007	58.21
2008	58.54
2009	55.35
2010	54.49