Year	% of children ages 12-23 months
1980	3
1981	14
1982	13
1983	9
1984	14
1985	19
1986	24
1987	28
1988	48
1989	50
1990	41
1991	36
1992	38
1993	39
1994	41
1995	42
1996	42
1997	42
1998	41
1999	39
2000	43
2001	46
2002	50
2003	53
2004	57
2005	60
2006	62
2007	64
2008	64
2009	65
2010	67
2011	68
2012	66
2013	65
2014	63
2015	64
2016	64
2017	64
2018	64
2019	51
2020	51
2021	51
2022	51