Year % of children ages 12-23 months 1980 61 1981 43 1982 37 1983 49 1984 60 1985 71 1986 72 1987 72 1988 69 1989 81 1990 82 1991 86 1992 88 1993 90 1994 91 1995 92 1996 92 1997 92 1998 94 1999 92 2000 80 2001 93 2002 96 2003 92 2004 96 2005 97 2006 96 2007 94 2008 97 2009 99 2010 97 2011 93 2012 92 2013 97 2014 89 2015 99 2016 98 2017 97 2018 98 2019 98 2020 89 2021 98 2022 98