Year	Percent
1995	39.3
1996	35.93
1997	38.79
1998	39.37
1999	39.31
2000	40.48
2001	39.47
2002	38.69
2003	39.46
2004	36.43
2005	38.3
2006	39.91
2007	40.83
2008	42.15
2009	43.77
2010	44.1