Year	% of children ages 12-23 months
1980	4
1981	3
1982	7
1983	7
1984	8
1985	12
1986	10
1987	13
1988	15
1989	23
1990	38
1991	17
1992	12
1993	22
1994	54
1995	38
1996	54
1997	51
1998	44
1999	37
2000	36
2001	35
2002	36
2003	35
2004	35
2005	40
2006	44
2007	49
2008	54
2009	59
2010	64
2011	68
2012	62
2013	55
2014	54
2015	56
2016	57
2017	59
2018	55
2019	58
2020	60
2021	54
2022	56