Year % of children ages 12-23 months 1980 47 1981 57 1982 78 1983 88 1984 85 1985 75 1986 85 1987 94 1988 87 1989 81 1990 84 1991 92 1992 89 1993 87 1994 95 1995 97 1996 97 1997 98 1998 96 1999 97 2000 96 2001 95 2002 94 2003 93 2004 95 2005 96 2006 95 2007 95 2008 95 2009 95 2010 95 2011 95 2012 95 2013 95 2014 95 2015 95 2016 95 2017 95 2018 97 2019 96 2020 97 2021 96 2022 96