Year	% of children ages 12-23 months
1980	53
1981	55
1982	58
1983	60
1984	63
1985	68
1986	71
1987	76
1988	80
1989	84
1990	87
1991	90
1992	92
1993	91
1994	91
1995	92
1996	92
1997	91
1998	87
1999	88
2000	88
2001	85
2002	85
2003	82
2004	81
2005	82
2006	85
2007	86
2008	86
2009	86
2010	89
2011	90
2012	92
2013	93
2014	93
2015	93
2016	92
2017	92
2018	92
2019	91
2020	91
2021	91
2022	90