Year % of children ages 12-23 months 1980 21 1981 40 1982 51 1983 43 1984 43 1985 49 1986 85 1987 53 1988 59 1989 71 1990 86 1991 76 1992 69 1993 80 1994 82 1995 83 1996 81 1997 85 1998 84 1999 82 2000 96 2001 94 2002 88 2003 96 2004 97 2005 95 2006 99 2007 96 2008 96 2009 97 2010 98 2011 98 2012 96 2013 99 2014 95 2015 96 2016 95 2017 90 2018 97 2019 96 2020 82 2021 79 2022 81