Year % of children ages 12-23 months 1980 32 1981 29 1982 41 1983 33 1984 33 1985 51 1986 57 1987 57 1988 88 1989 82 1990 91 1991 88 1992 97 1993 99 1994 95 1995 98 1996 99 1997 99 1998 99 1999 99 2000 99 2001 96 2002 99 2003 99 2004 99 2005 95 2006 98 2007 99 2008 99 2009 99 2010 99 2011 99 2012 99 2013 98 2014 99 2015 98 2016 99 2017 99 2018 99 2019 99 2020 99 2021 98 2022 99