Year	% (national estimate)
1964	86.83
1973	80.27
1978	69.49
1979	76.42
1980	81.33
1981	73.53
1985	74.39
1987	83.75
1989	82.29
1994	73.39
1999	76.78
2003	81.996
2004	76.789
2006	79.58
2010	69.128
2011	71.086
2012	77.109
2013	68.434
2014	71.179
2015	72.681
2016	71.898
2017	74.532
2018	73.051
2019	71.71
2021	74.843
2022	71.116