Year	% of children ages 12-23 months
1981	56
1982	58
1983	60
1984	62
1985	78
1986	83
1987	88
1988	88
1989	87
1990	87
1991	87
1992	86
1993	86
1994	87
1995	87
1996	88
1997	84
1998	79
1999	77
2000	75
2001	73
2002	70
2003	68
2004	66
2005	67
2006	68
2007	69
2008	70
2009	76
2010	90
2011	92
2012	97
2013	93
2014	92
2015	86
2016	95
2017	90
2018	88
2019	85
2020	85
2021	88
2022	90