Year	% of children ages 12-23 months
1983	27
1984	31
1985	35
1986	59
1987	68
1988	52
1989	65
1990	53
1991	52
1992	60
1993	68
1994	68
1995	45
1996	49
1997	51
1998	61
1999	70
2000	71
2001	72
2002	73
2003	74
2004	75
2005	76
2006	74
2007	73
2008	71
2009	69
2010	76
2011	83
2012	81
2013	81
2014	81
2015	80
2016	80
2017	66
2018	79
2019	79
2020	72
2021	63
2022	75