Year % of children ages 12-23 months 1980 49 1981 49 1982 55 1983 59 1984 52 1985 67 1986 69 1987 69 1988 73 1989 75 1990 75 1991 64 1992 60 1993 55 1994 47 1995 38 1996 42 1997 18 1998 21 1999 23 2000 34 2001 35 2002 37 2003 50 2004 65 2005 54 2006 61 2007 59 2008 69 2009 63 2010 75 2011 83 2012 80 2013 80 2014 80 2015 80 2016 67 2017 70 2018 75 2019 73 2020 68 2021 68 2022 65