Year	Percent
2003	20.45403
2004	17.91012
2005	19.41867
2007	20.42524
2008	27.58759
2009	23.84549
2010	25.08849
2011	26.9833
2013	30.53217
2014	23.83107
2015	28.34318
2016	27.15988