Year	% of children ages 12-23 months
1980	1
1981	1
1982	2
1983	3
1984	4
1985	8
1986	14
1987	27
1988	40
1989	60
1990	62
1991	62
1992	53
1993	51
1994	46
1995	48
1996	56
1997	55
1998	46
1999	55
2000	62
2001	66
2002	60
2003	69
2004	74
2005	78
2006	78
2007	84
2008	86
2009	81
2010	90
2011	93
2012	92
2013	93
2014	94
2015	93
2016	93
2017	95
2018	93
2019	93
2020	90
2021	84
2022	84