Year	% of children ages 12-23 months
1980	47
1981	78
1982	60
1983	60
1984	59
1985	73
1986	70
1987	72
1988	75
1989	70
1990	86
1991	82
1992	77
1993	83
1994	83
1995	86
1996	91
1997	95
1998	98
1999	92
2000	98
2001	99
2002	99
2003	98
2004	95
2005	92
2006	88
2007	85
2008	86
2009	85
2010	94
2011	87
2012	85
2013	80
2014	80
2015	73
2016	86
2017	81
2018	88
2019	88
2020	74
2021	87
2022	87