Year	% of children ages 12-23 months
1981	9
1982	14
1983	18
1984	11
1985	24
1986	37
1987	61
1988	54
1989	72
1990	77
1991	73
1992	69
1993	66
1994	62
1995	58
1996	50
1997	42
1998	42
1999	57
2000	64
2001	50
2002	59
2003	72
2004	71
2005	82
2006	84
2007	82
2008	81
2009	78
2010	83
2011	85
2012	84
2013	84
2014	84
2015	82
2016	82
2017	83
2018	81
2019	84
2020	82
2021	83
2022	82