Year	Percent
1995	46.56
1996	49
1997	44.8
1998	47.94
1999	48.55
2000	51.21
2001	58.07
2002	55.46
2003	58.41
2004	57.39
2005	53.35
2006	60.05
2007	66.4
2008	70.1
2009	74.3
2010	76.24