Year	% of children ages 12-23 months
1980	45
1981	50
1982	54
1983	59
1984	65
1985	78
1986	78
1987	78
1988	78
1989	85
1990	87
1991	88
1992	87
1993	90
1994	93
1995	95
1996	95
1997	94
1998	99
1999	94
2000	98
2001	98
2002	99
2003	99
2004	99
2005	99
2006	99
2007	99
2008	99
2009	99
2010	99
2011	99
2012	99
2013	99
2014	99
2015	99
2016	99
2017	99
2018	99
2019	99
2020	99
2021	99
2022	99