Year	Percent
1995	54.4
1996	54.71
1997	52.05
1998	56.01
1999	56.56
2000	58.7
2001	57.93
2002	57.62
2003	58.69
2004	58.8
2005	59.41
2006	56.3
2007	58.5
2008	62.3
2009	57.7
2010	54.02