Year	Percent
2000	53.41089
2001	56.04324
2002	56.04097
2003	55.22697
2004	55.29996
2005	56.86708
2006	56.156
2007	56.02793
2008	55.80163
2009	55.67736
2010	56.66756
2011	60.33955
2012	63.972
2013	65.36152
2014	66.02928
2015	67.89733
2016	66.92516
2017	66.31893