Year	Percent
1995	37.78
1996	43.36
1997	42.02
1998	42.97
1999	44.25
2000	47.19
2001	42.28
2002	43.69
2003	42.64
2004	42.69
2005	40.3
2006	39.02
2007	36.23
2008	37.04
2009	36.24
2010	37.31