Year	Percent
1995	52.36
1996	52.5
1997	56.5
1998	56.45
1999	57.76
2000	62.17
2001	70.02
2002	71.14
2003	68.51
2004	76.64
2005	74.28
2006	72.94
2007	76.47
2008	75.98
2009	76.02
2010	72.53