Year	% of children ages 12-23 months
1980	34
1981	56
1982	26
1983	34
1984	30
1985	61
1986	91
1987	93
1988	90
1989	93
1990	93
1991	94
1992	94
1993	95
1994	95
1995	96
1996	98
1997	98
1998	98
1999	97
2000	97
2001	97
2002	98
2003	98
2004	98
2005	98
2006	97
2007	97
2008	97
2009	99
2010	99
2011	99
2012	99
2013	99
2014	99
2015	97
2016	97
2017	97
2018	99
2019	96
2020	96
2021	96
2022	96