Year	% of children ages 12-23 months
1980	32
1981	32
1982	29
1983	27
1984	34
1985	40
1986	44
1987	44
1988	48
1989	53
1990	68
1991	68
1992	58
1993	58
1994	61
1995	62
1996	56
1997	45
1998	60
1999	60
2000	59
2001	55
2002	61
2003	68
2004	62
2005	72
2006	70
2007	66
2008	56
2009	64
2010	55
2011	58
2012	57
2013	60
2014	52
2015	49
2016	46
2017	36
2018	35
2019	35
2020	39
2021	31
2022	36