Year	% of children ages 12-23 months
1981	1
1982	1
1983	2
1984	3
1985	6
1986	11
1987	22
1988	44
1989	61
1990	57
1991	57
1992	52
1993	49
1994	48
1995	51
1996	59
1997	58
1998	49
1999	51
2000	58
2001	58
2002	58
2003	65
2004	67
2005	69
2006	73
2007	79
2008	79
2009	82
2010	90
2011	87
2012	85
2013	85
2014	86
2015	87
2016	86
2017	90
2018	88
2019	90
2020	86
2021	81
2022	81