Year	% (national estimate)
1997	49.75
1998	49.6
1999	49.2
2000	73.711
2001	72.286
2002	70.948
2003	69.766
2004	68.607
2005	67.791
2006	67.12
2007	66.38
2008	65.6
2009	65.15
2010	64.85
2011	64.5
2012	64.9
2013	65.3
2014	65.6
2015	65.7
2016	66.6
2017	66.9
2018	66.8
2019	67.344
2020	65.766
2021	66.374
2022	66.2