Year % of children ages 12-23 months 1980 29 1981 40 1982 48 1983 56 1984 65 1985 73 1986 81 1987 87 1988 87 1989 84 1990 87 1991 85 1992 91 1993 88 1994 91 1995 92 1996 94 1997 95 1998 93 1999 83 2000 94 2001 99 2002 95 2003 96 2004 99 2005 95 2006 99 2007 95 2008 95 2009 95 2010 98 2011 98 2012 98 2013 97 2014 98 2015 94 2016 96 2017 93 2018 92 2019 87 2020 76 2021 76 2022 76