Year	Percent
1995	35.76
1996	34.66
1997	35.74
1998	43.77
1999	50.71
2000	51.45
2001	54.91
2002	49.9
2003	52.39
2004	50.71
2005	54.38
2006	55.59
2007	54.8
2008	52.77
2009	51.48
2010	54.21