Year	% of children ages 12-23 months
1980	49
1981	52
1982	49
1983	49
1984	53
1985	62
1986	66
1987	75
1988	80
1989	84
1990	92
1991	90
1992	85
1993	89
1994	93
1995	96
1996	94
1997	95
1998	96
1999	97
2000	97
2001	96
2002	96
2003	98
2004	98
2005	98
2006	98
2007	98
2008	99
2009	99
2010	99
2011	99
2012	99
2013	99
2014	99
2015	99
2016	99
2017	99
2018	97
2019	97
2020	97
2021	97
2022	97