Year	% of children ages 12-23 months
1980	94
1981	94
1982	95
1983	95
1984	95
1985	96
1986	96
1987	96
1988	96
1989	94
1990	94
1991	78
1992	94
1993	96
1994	99
1995	97
1996	98
1997	99
1998	96
1999	97
2000	97
2001	97
2002	98
2003	97
2004	97
2005	98
2006	97
2007	98
2008	99
2009	98
2010	99
2011	99
2012	99
2013	99
2014	98
2015	99
2016	98
2017	99
2018	99
2019	99
2020	98
2021	98
2022	97