Year % of children ages 12-23 months 1980 49 1981 52 1982 49 1983 49 1984 53 1985 62 1986 66 1987 75 1988 80 1989 84 1990 92 1991 90 1992 85 1993 89 1994 93 1995 96 1996 94 1997 95 1998 96 1999 97 2000 97 2001 96 2002 96 2003 98 2004 98 2005 98 2006 98 2007 98 2008 99 2009 99 2010 99 2011 99 2012 99 2013 99 2014 99 2015 99 2016 99 2017 99 2018 97 2019 97 2020 97 2021 97 2022 97