Year	Percent
1995	61.73
1996	63.37
1997	62.66
1998	61.72
1999	60.1
2000	58.36
2001	57.05
2002	56.24
2003	61.2
2004	60.15
2005	59.97
2006	57.87
2007	56.8
2008	55.95
2009	52.36
2010	51.82