Year	% of children ages 12-23 months
1981	30
1982	38
1983	46
1984	50
1985	54
1986	74
1987	65
1988	85
1989	85
1990	85
1991	80
1992	85
1993	85
1994	94
1995	94
1996	82
1997	92
1998	92
1999	92
2000	92
2001	93
2002	93
2003	93
2004	93
2005	93
2006	93
2007	94
2008	94
2009	94
2010	94
2011	87
2012	88
2013	96
2014	97
2015	89
2016	89
2017	89
2018	85
2019	81
2020	76
2021	80
2022	83