Year	Percent
1995	61.24
1996	63.6
1997	56.2
1998	53.51
1999	49.91
2000	51.8
2001	54.3
2002	56.19
2003	58.3
2004	58.55
2005	59.46
2006	60.77
2007	61.85
2008	57.66
2009	55.03
2010	56.63