Year	Percent
2000	58.17693
2001	57.35613
2002	57.08107
2003	56.18789
2004	56.8953
2005	57.64895
2006	55.84565
2007	55.34476
2008	55.23972
2009	57.40112
2010	58.64222
2011	60.61759
2012	61.52481
2013	58.56656
2014	58.55422
2015	60.27779
2016	59.42061
2017	54.54408