Year	Percent
1995	28.75
1996	29.22
1997	29.88
1998	29.43
1999	30.03
2000	29.64
2001	30.02
2002	30.47
2003	29.83
2004	29.78
2005	29.78
2006	30.23
2007	29.78
2008	29.51
2009	29.38
2010	29.5