Year	% (national estimate)
2000	68.94903356342434
2001	71.05895258127538
2002	70.14293563005415
2003	69.77968639760452
2004	69.30021839638783
2005	68.77845351840435
2006	68.64095506397072
2007	68.85666480305272
2008	68.10102040079043
2009	68.01793669520612
2010	66.9646437034243
2011	67.04950462806757
2012	66.91767875593581
2013	66.8449456277592
2014	66.82386940462362
2015	66.63854680333898
2016	66.54977703767763
2017	66.25984131616704
2018	66.18351055962235
2019	66.16048087722001