Year	Percent
1995	29.13
1996	25.56
1997	27.27
1998	24.94
1999	23.71
2000	23.25
2001	24.98
2002	20
2003	20.4
2004	18.06
2005	18.66
2006	15.04
2007	14.11
2008	14.24
2009	14.66
2010	12.34