Year	% of children ages 12-23 months
1980	31
1981	34
1982	48
1983	49
1984	44
1985	53
1986	60
1987	57
1988	76
1989	94
1990	90
1991	86
1992	89
1993	94
1994	93
1995	89
1996	91
1997	89
1998	98
1999	98
2000	98
2001	99
2002	97
2003	95
2004	92
2005	96
2006	95
2007	94
2008	93
2009	98
2010	98
2011	97
2012	97
2013	97
2014	97
2015	98
2016	98
2017	98
2018	91
2019	89
2020	82
2021	81
2022	77