Year	% of children ages 12-23 months
1984	9
1985	17
1986	28
1987	36
1988	46
1989	59
1990	54
1991	57
1992	43
1993	40
1994	41
1995	44
1996	38
1997	38
1998	38
1999	35
2000	33
2001	32
2002	30
2003	34
2004	37
2005	41
2006	44
2007	41
2008	53
2009	64
2010	56
2011	49
2012	42
2013	43
2014	44
2015	42
2016	48
2017	54
2018	56
2019	58
2020	60
2021	60
2022	60