Year	% of children ages 12-23 months
1981	22
1982	21
1983	20
1984	18
1985	17
1986	27
1987	38
1988	49
1989	51
1990	52
1991	54
1992	56
1993	57
1994	59
1995	57
1996	55
1997	54
1998	50
1999	55
2000	57
2001	59
2002	62
2003	64
2004	66
2005	68
2006	75
2007	75
2008	70
2009	77
2010	73
2011	75
2012	80
2013	83
2014	85
2015	79
2016	79
2017	83
2018	86
2019	87
2020	89
2021	90
2022	90