Year % of children ages 12-23 months 1980 36 1981 55 1982 69 1983 65 1984 69 1985 86 1986 85 1987 85 1988 85 1989 86 1990 86 1991 92 1992 92 1993 91 1994 91 1995 87 1996 85 1997 86 1998 89 1999 82 2000 99 2001 99 2002 94 2003 92 2004 93 2005 93 2006 95 2007 95 2008 93 2009 96 2010 99 2011 98 2012 98 2013 97 2014 96 2015 95 2016 94 2017 94 2018 90 2019 89 2020 83 2021 86 2022 87