Year	% of children ages 12-23 months
1983	39
1984	49
1985	58
1986	68
1987	77
1988	71
1989	80
1990	80
1991	80
1992	80
1993	83
1994	86
1995	88
1996	91
1997	91
1998	92
1999	92
2000	93
2001	94
2002	94
2003	95
2004	95
2005	95
2006	95
2007	96
2008	96
2009	96
2010	96
2011	96
2012	99
2013	99
2014	99
2015	99
2016	99
2017	99
2018	99
2019	99
2020	99
2021	99
2022	99