Year	Percent
1995	20.31
1996	20.44
1997	20.36
1998	20.48
1999	20.55
2000	20.62
2001	20.62
2002	20.34
2003	21.08
2004	21.18
2005	21.16
2006	21.26
2007	21.66
2008	22.3
2009	22.07
2010	22.15