Year	Percent
1995	14.65
1996	15.36
1997	15.4
1998	15.39
1999	16.4
2000	16.03
2001	17.33
2002	17.42
2003	18.05
2004	18.36
2005	18.92
2006	19
2007	19.47
2008	19.71
2009	19.91
2010	19.9