Year	% of children ages 12-23 months
1981	7
1982	7
1983	7
1984	6
1985	6
1986	10
1987	11
1988	23
1989	20
1990	32
1991	47
1992	46
1993	46
1994	73
1995	68
1996	73
1997	67
1998	71
1999	71
2000	42
2001	50
2002	55
2003	42
2004	36
2005	41
2006	48
2007	40
2008	52
2009	59
2010	64
2011	67
2012	69
2013	78
2014	81
2015	81
2016	81
2017	86
2018	86
2019	83
2020	79
2021	73
2022	76