Year	% of children ages 12-23 months
1981	32
1982	58
1983	51
1984	50
1985	39
1986	39
1987	37
1988	44
1989	48
1990	59
1991	55
1992	56
1993	62
1994	65
1995	71
1996	58
1997	61
1998	64
1999	67
2000	71
2001	74
2002	77
2003	80
2004	79
2005	78
2006	76
2007	75
2008	77
2009	80
2010	82
2011	83
2012	85
2013	86
2014	87
2015	87
2016	87
2017	87
2018	87
2019	87
2020	81
2021	84
2022	84