Year % of children ages 12-23 months 1983 39 1984 49 1985 58 1986 68 1987 77 1988 71 1989 80 1990 80 1991 80 1992 80 1993 83 1994 86 1995 88 1996 91 1997 91 1998 92 1999 92 2000 93 2001 94 2002 94 2003 95 2004 95 2005 95 2006 95 2007 96 2008 96 2009 96 2010 96 2011 96 2012 99 2013 99 2014 99 2015 99 2016 99 2017 99 2018 99 2019 99 2020 99 2021 99 2022 99