Year	% of children ages 12-23 months
1983	10
1984	10
1985	63
1986	65
1987	66
1988	68
1989	78
1990	78
1991	78
1992	78
1993	78
1994	78
1995	77
1996	77
1997	77
1998	77
1999	77
2000	79
2001	73
2002	73
2003	78
2004	81
2005	84
2006	86
2007	87
2008	89
2009	90
2010	90
2011	92
2012	92
2013	93
2014	93
2015	93
2016	92
2017	92
2018	92
2019	91
2020	92
2021	90
2022	90