Year	Percent
1995	26.61
1996	26.53
1997	26.36
1998	26.7
1999	26.11
2000	24.5
2001	22.15
2002	22.39
2003	22.38
2004	21.19
2005	20.47
2006	19.88
2007	20.11
2008	19.65
2009	19.65
2010	19.6