Year	Percent
1995	20.86
1996	21.71
1997	20.27
1998	21.37
1999	20.95
2000	21.67
2001	21.36
2002	22.22
2003	22.78
2004	23.13
2005	20.99
2006	22.06
2007	24.63
2008	26.09
2009	30.61
2010	28.99