Year	% of children ages 12-23 months
1980	40
1981	37
1982	52
1983	63
1984	51
1985	92
1986	75
1987	99
1988	92
1989	93
1990	94
1991	88
1992	99
1993	96
1994	89
1995	95
1996	99
1997	96
1998	97
1999	94
2000	95
2001	94
2002	90
2003	98
2004	99
2005	99
2006	99
2007	99
2008	99
2009	99
2010	99
2011	99
2012	95
2013	99
2014	98
2015	96
2016	96
2017	99
2018	99
2019	99
2020	99
2021	99
2022	99