Year	% of children ages 12-23 months
1980	21
1981	21
1982	20
1983	21
1984	36
1985	44
1986	51
1987	58
1988	64
1989	79
1990	93
1991	89
1992	86
1993	84
1994	81
1995	85
1996	85
1997	84
1998	71
1999	77
2000	78
2001	78
2002	78
2003	88
2004	87
2005	93
2006	90
2007	95
2008	99
2009	94
2010	95
2011	95
2012	95
2013	94
2014	97
2015	97
2016	97
2017	97
2018	97
2019	97
2020	93
2021	97
2022	97