Year	% of children ages 12-23 months
1980	28
1981	34
1982	46
1983	52
1984	41
1985	58
1986	62
1987	58
1988	74
1989	85
1990	84
1991	94
1992	93
1993	94
1994	94
1995	94
1996	94
1997	95
1998	97
1999	95
2000	94
2001	96
2002	95
2003	92
2004	94
2005	98
2006	95
2007	94
2008	93
2009	97
2010	97
2011	97
2012	98
2013	99
2014	99
2015	98
2016	95
2017	90
2018	91
2019	88
2020	80
2021	77
2022	78