Year	Percent
1995	39.85
1996	40.1
1997	41.81
1998	44.92
1999	46.75
2000	47.61
2001	47.5
2002	47.09
2003	46.67
2004	47.18
2005	44.27
2006	47.21
2007	44.96
2008	45.23
2009	46.83
2010	45.6