Year	Percent
1995	41.1
1996	38.43
1997	39.9
1998	37.52
1999	37.65
2000	36.08
2001	30.14
2002	30.74
2003	28.7
2004	29.41
2005	32.19
2006	27.57
2007	23.19
2008	20.64
2009	17.74
2010	16.39