Year	Percent
1995	57.03
1996	52.41
1997	47.99
1998	47.39
1999	45.71
2000	46.32
2001	59.92
2002	78.36
2003	66.21
2004	57.25
2005	58.8
2006	66.34
2007	69.91
2008	55.72
2009	76.03
2010	75.93