Year	% of children ages 12-23 months
1980	11
1982	8
1983	9
1984	14
1985	14
1986	14
1987	31
1988	34
1989	22
1990	20
1991	19
1992	22
1993	25
1994	40
1995	41
1996	42
1997	38
1998	31
1999	31
2000	27
2001	37
2002	35
2003	39
2004	48
2005	50
2006	53
2007	55
2008	59
2009	60
2010	62
2011	64
2012	59
2013	57
2014	60
2015	62
2016	64
2017	67
2018	71
2019	64
2020	66
2021	63
2022	68