Year	Percent
1995	42.59
1996	42.49
1997	36.88
1998	35.37
1999	34.51
2000	33.72
2001	33.07
2002	27.2
2003	26.85
2004	26.09
2005	27.23
2006	17.38
2007	14.5
2008	14.53
2009	15.15
2010	13.92