Year	Percent
1995	47.01
1996	47.18
1997	53.95
1998	54.82
1999	54.89
2000	56.15
2001	56.38
2002	63.52
2003	63.79
2004	64.91
2005	64.39
2006	72.7
2007	76.33
2008	76.15
2009	74.59
2010	75.04