Year	% of children ages 12-23 months
1987	70
1988	85
1989	87
1990	89
1991	92
1992	94
1993	96
1994	97
1995	96
1996	97
1997	96
1998	96
1999	96
2000	96
2001	95
2002	95
2003	95
2004	94
2005	94
2006	93
2007	94
2008	93
2009	91
2010	90
2011	88
2012	89
2013	90
2014	90
2015	89
2016	89
2017	90
2018	90
2019	90
2020	90
2021	90
2022	92