Year	% of children ages 12-23 months
1981	56
1982	43
1983	38
1984	32
1985	29
1986	32
1987	39
1988	38
1989	47
1990	46
1991	46
1992	50
1993	49
1994	55
1995	57
1996	60
1997	62
1998	65
1999	68
2000	70
2001	73
2002	76
2003	85
2004	83
2005	80
2006	78
2007	75
2008	75
2009	74
2010	74
2011	78
2012	81
2013	85
2014	88
2015	88
2016	88
2017	88
2018	88
2019	88
2020	79
2021	61
2022	61