Year	Percent
1995	74.45
1996	79.24
1997	76.49
1998	73.86
1999	70.88
2000	66.54
2001	68.65
2002	74.42
2003	77.6
2004	67.31
2005	70.83
2006	66.02
2007	60.43
2008	58.83
2009	64.94
2010	62.11