Year	Percent
1995	15.63624
2000	16.73695
2005	17.91107
2006	17.69628
2007	17.27262
2008	17.62774
2009	19.93359
2010	22.39941
2011	20.05691
2012	18.23062
2013	18.75472
2014	18.3283