Year	% of children ages 12-23 months
1981	18
1982	17
1983	16
1984	27
1985	37
1986	32
1987	38
1988	41
1989	38
1990	35
1991	16
1992	23
1993	29
1994	26
1995	23
1996	18
1997	18
1998	18
1999	25
2000	40
2001	30
2002	38
2003	41
2004	54
2005	60
2006	62
2007	65
2008	68
2009	71
2010	60
2011	70
2012	71
2013	71
2014	73
2015	70
2016	70
2017	71
2018	71
2019	73
2020	70
2021	65
2022	65