Year	Percent
1995	69.59
1996	68.1
1997	63.39
1998	45.83
1999	46.68
2000	44.07
2001	44.85
2002	43.88
2003	45.4
2004	41.72
2005	43.29
2006	41.85
2007	41.52
2008	45.84
2009	45.35
2010	47.47