Year	% of children ages 12-23 months
1982	15
1983	18
1984	20
1985	27
1986	19
1987	22
1988	68
1989	75
1990	85
1991	53
1992	41
1993	41
1994	42
1995	41
1996	41
1997	31
1998	21
1999	23
2000	50
2001	49
2002	62
2003	66
2004	60
2005	65
2006	67
2007	74
2008	73
2009	84
2010	85
2011	84
2012	83
2013	80
2014	71
2015	74
2016	75
2017	81
2018	86
2019	83
2020	62
2021	50
2022	50