Year	% of children ages 12-23 months
1980	18
1981	19
1982	24
1983	31
1984	45
1985	60
1986	82
1987	89
1988	90
1989	98
1990	98
1991	95
1992	99
1993	97
1994	97
1995	99
1996	99
1997	99
1998	99
1999	99
2000	99
2001	99
2002	99
2003	99
2004	99
2005	99
2006	98
2007	99
2008	99
2009	98
2010	99
2011	99
2012	98
2013	98
2014	99
2015	99
2016	99
2017	99
2018	99
2019	99
2020	99
2021	99
2022	99