Year	% of children ages 12-23 months
1980	18
1981	23
1982	25
1983	30
1984	30
1985	40
1986	39
1987	41
1988	44
1989	41
1990	38
1991	17
1992	25
1993	33
1994	39
1995	27
1996	21
1997	20
1998	20
1999	15
2000	46
2001	35
2002	42
2003	49
2004	57
2005	61
2006	63
2007	64
2008	64
2009	65
2010	66
2011	66
2012	69
2013	68
2014	69
2015	65
2016	63
2017	65
2018	64
2019	65
2020	62
2021	55
2022	56