Year	% of children ages 12-23 months
1981	2
1982	4
1983	4
1984	4
1985	17
1986	30
1987	46
1988	63
1989	79
1990	82
1991	86
1992	90
1993	91
1994	92
1995	93
1996	93
1997	92
1998	89
1999	86
2000	83
2001	80
2002	77
2003	74
2004	75
2005	77
2006	78
2007	80
2008	81
2009	81
2010	82
2011	82
2012	83
2013	83
2014	83
2015	83
2016	83
2017	83
2018	83
2019	83
2020	71
2021	67
2022	67