Year	Percent
1995	19.92
1996	22.88
1997	24.57
1998	24.89
1999	23.15
2000	21.41
2001	18.55
2002	18.98
2003	20.51
2004	19.8
2005	18.98
2006	18.81
2007	18.81
2008	18.81
2009	19.31
2010	20.15