Year	% of children ages 12-23 months
1980	25
1981	50
1982	50
1983	47
1984	48
1985	50
1986	70
1987	75
1988	75
1989	75
1990	75
1991	75
1992	75
1993	89
1994	90
1995	92
1996	91
1997	91
1998	92
1999	92
2000	92
2001	94
2002	94
2003	95
2004	96
2005	96
2006	96
2007	97
2008	97
2009	97
2010	97
2011	97
2012	97
2013	97
2014	97
2015	97
2016	97
2017	97
2018	97
2019	97
2020	97
2021	97
2022	97