Year	Percent
1995	47.07
1996	44.14
1997	44.48
1998	43
1999	54.45
2000	57.64
2001	60.68
2002	63.28
2003	69.19
2004	57.2
2005	54.97
2006	55.48
2007	56.55
2008	58.19
2009	61.35
2010	61.4