Year	Percent
2000	54.79053
2001	55.77697
2002	56.747
2003	57.69924
2004	58.63359
2005	59.54838
2006	60.44434
2007	61.32078
2008	62.17771
2009	63.01432
2010	63.83119
2011	64.62837
2012	65.40607
2013	66.04694
2014	66.11511
2015	66.18252
2016	66.24854
2017	66.31279