Year	% of children ages 12-23 months
1982	15
1983	23
1984	19
1985	23
1986	30
1987	35
1988	42
1989	45
1990	46
1991	53
1992	65
1993	66
1994	66
1995	57
1996	49
1997	49
1998	52
1999	55
2000	57
2001	60
2002	62
2003	66
2004	78
2005	85
2006	85
2007	84
2008	77
2009	77
2010	70
2011	73
2012	68
2013	70
2014	68
2015	62
2016	68
2017	65
2018	74
2019	70
2020	68
2021	57
2022	57