Year	% of children ages 12-23 months
1980	4
1981	1
1982	1
1983	13
1984	24
1985	28
1986	42
1987	42
1988	86
1989	91
1990	94
1991	98
1992	98
1993	90
1994	96
1995	94
1996	97
1997	97
1998	97
1999	97
2000	98
2001	98
2002	98
2003	98
2004	96
2005	98
2006	98
2007	98
2008	98
2009	98
2010	96
2011	96
2012	99
2013	99
2014	99
2015	99
2016	99
2017	99
2018	99
2019	98
2020	99
2021	96
2022	99