Year	Percent
2002	60.3576
2003	56.7995
2004	57.41511
2005	58.35574
2006	60.03103
2007	60.07554
2008	60.5704
2009	60.60813
2010	59.34752
2011	59.36533
2012	60.72574
2013	62.43228
2014	61.68342
2015	62.11863
2016	61.18271
2017	60.29383