Year % of children ages 12-23 months 1980 50 1981 52 1982 51 1983 52 1984 67 1985 55 1986 61 1987 86 1988 87 1989 97 1990 98 1991 97 1992 90 1993 90 1994 77 1995 64 1996 50 1997 37 1998 43 1999 50 2000 56 2001 62 2002 64 2003 68 2004 72 2005 79 2006 89 2007 92 2008 92 2009 93 2010 93 2011 94 2012 96 2013 93 2014 93 2015 96 2016 96 2017 97 2018 97 2019 97 2020 97 2021 41 2022 0