Year	% of children ages 12-23 months
1980	13
1981	11
1982	14
1983	16
1984	17
1985	20
1986	19
1987	22
1988	42
1989	64
1990	82
1991	64
1992	45
1993	47
1994	48
1995	53
1996	48
1997	43
1998	43
1999	33
2000	37
2001	40
2002	44
2003	47
2004	51
2005	54
2006	51
2007	48
2008	45
2009	42
2010	45
2011	47
2012	47
2013	23
2014	45
2015	43
2016	42
2017	42
2018	42
2019	42
2020	42
2021	42
2022	42