Year	% (national estimate)
2000	71.44
2001	75.34
2002	74.43
2003	73.82
2004	73.23
2005	72.8
2006	72.44
2007	72.02
2008	71.43
2009	70.89
2010	69.18
2011	68.89
2012	68.74
2013	68.61
2014	68.47
2015	68.36
2016	68.17
2017	67.93
2018	67.66
2019	67.35