Year	% of children ages 12-23 months
1981	6
1982	6
1983	5
1984	5
1985	4
1986	5
1987	7
1988	9
1989	13
1990	22
1991	19
1992	20
1993	20
1994	20
1995	23
1996	23
1997	25
1998	29
1999	32
2000	34
2001	36
2002	39
2003	41
2004	43
2005	45
2006	51
2007	57
2008	67
2009	71
2010	70
2011	75
2012	71
2013	73
2014	81
2015	84
2016	80
2017	85
2018	79
2019	81
2020	81
2021	82
2022	84