Year	Percent
1995	47.64
1996	47.5
1997	43.5
1998	43.55
1999	42.24
2000	37.83
2001	29.98
2002	28.86
2003	31.49
2004	23.36
2005	25.72
2006	27.06
2007	23.53
2008	24.02
2009	23.98
2010	27.47