Year	% of children ages 12-23 months
1980	33
1981	40
1982	48
1983	55
1984	62
1985	68
1986	75
1987	81
1988	88
1989	93
1990	95
1991	93
1992	91
1993	90
1994	88
1995	86
1996	86
1997	77
1998	82
1999	88
2000	90
2001	92
2002	92
2003	93
2004	92
2005	92
2006	92
2007	92
2008	92
2009	92
2010	92
2011	92
2012	92
2013	91
2014	92
2015	93
2016	94
2017	95
2018	95
2019	95
2020	95
2021	95
2022	94