Year	Percent
1995	95.96
1996	96.74
1997	95.05
1998	96.3
1999	94.27
2000	95.92
2001	94.81
2002	94.14
2003	78.82
2004	78.17
2005	70.03
2006	68.94
2007	63.82
2008	52.89
2009	55.29
2010	57.48