Year	Percent
2003	19.62694
2004	20.65959
2005	19.06312
2006	19.14766
2007	18.23539
2008	20.37936
2009	25.67563
2010	20.96879
2011	18.48599
2012	17.20628
2013	16.38971
2014	16.72989