Year	% of children ages 12-23 months
1985	11
1986	17
1987	32
1988	46
1989	18
1990	88
1991	85
1992	82
1993	79
1994	80
1995	81
1996	81
1997	82
1998	82
1999	51
2000	50
2001	50
2002	49
2003	48
2004	48
2005	47
2006	47
2007	46
2008	45
2009	45
2010	44
2011	46
2012	49
2013	51
2014	53
2015	50
2016	53
2017	53
2018	53
2019	53
2020	53
2021	53
2022	53