Year	% of children ages 12-23 months
1983	6
1984	8
1985	8
1986	10
1987	10
1988	12
1989	18
1990	24
1991	26
1992	21
1993	30
1994	27
1995	24
1996	28
1997	41
1998	47
1999	21
2000	31
2001	42
2002	47
2003	46
2004	47
2005	47
2006	44
2007	48
2008	49
2009	50
2010	51
2011	52
2012	53
2013	54
2014	55
2015	59
2016	59
2017	56
2018	63
2019	57
2020	51
2021	45
2022	42