Year	Percent
1994	15.28769
1995	15.14382
1996	14.93927
1997	17.14077
1998	17.5109
1999	15.54927
2000	15.82535
2001	15.92979
2002	15.29057
2003	16.91343
2004	17.94856
2005	18.92846
2006	20.18046
2007	20.2699
2008	18.92044
2009	14.89284
2010	14.77365
2011	14.63321