Year	Percent
1995	58.53
1996	58.23
1997	55.93
1998	67.93
1999	73.16
2000	79.61
2001	79.29
2002	79.76
2003	79.59
2004	78.06
2005	76.35
2006	76.92
2007	77.84
2008	75.44
2009	75.06
2010	73.34