Year	% of children ages 12-23 months
1983	9
1984	18
1985	18
1986	47
1987	55
1988	66
1989	54
1990	61
1991	63
1992	67
1993	63
1994	74
1995	45
1996	53
1997	63
1998	54
1999	45
2000	49
2001	53
2002	57
2003	60
2004	64
2005	68
2006	71
2007	74
2008	77
2009	80
2010	83
2011	86
2012	87
2013	87
2014	86
2015	86
2016	85
2017	79
2018	82
2019	78
2020	74
2021	67
2022	74