Year	Percent
2001	53.70295
2002	55.17564
2003	56.72236
2004	53.22186
2005	56.75833
2006	54.68774
2007	53.74489
2008	54.19741
2009	55.28627
2010	57.00038
2011	54.0468
2012	54.01366
2013	54.86464
2014	55.87547
2015	54.35674
2016	51.20034
2017	50.34473