Year	% of children ages 12-23 months
1981	1
1982	1
1983	6
1984	13
1985	27
1986	47
1987	50
1988	54
1989	57
1990	60
1991	62
1992	64
1993	66
1994	68
1995	69
1996	72
1997	73
1998	74
1999	75
2000	75
2001	76
2002	70
2003	71
2004	71
2005	72
2006	72
2007	73
2008	77
2009	78
2010	81
2011	81
2012	87
2013	92
2014	88
2015	84
2016	84
2017	85
2018	85
2019	85
2020	77
2021	67
2022	85