Year	% of children ages 12-23 months
1980	50
1981	55
1982	52
1983	65
1984	66
1985	59
1986	82
1987	88
1988	72
1989	82
1990	97
1991	96
1992	93
1993	90
1994	90
1995	90
1996	89
1997	92
1998	96
1999	99
2000	89
2001	94
2002	95
2003	95
2004	95
2005	95
2006	94
2007	96
2008	95
2009	94
2010	95
2011	95
2012	96
2013	96
2014	96
2015	96
2016	95
2017	96
2018	97
2019	96
2020	95
2021	93
2022	96