Year	% of children ages 12-23 months
1980	12
1981	15
1982	16
1983	16
1984	19
1985	23
1986	24
1987	17
1988	40
1989	69
1990	82
1991	57
1992	32
1993	42
1994	52
1995	46
1996	44
1997	42
1998	37
1999	37
2000	36
2001	35
2002	42
2003	49
2004	55
2005	62
2006	61
2007	59
2008	58
2009	56
2010	53
2011	49
2012	48
2013	25
2014	47
2015	46
2016	45
2017	41
2018	41
2019	41
2020	41
2021	41
2022	41