Year	% of children ages 12-23 months
1980	37
1981	47
1982	56
1983	60
1984	68
1985	66
1986	58
1987	58
1988	58
1989	56
1990	66
1991	78
1992	71
1993	75
1994	74
1995	81
1996	77
1997	79
1998	93
1999	94
2000	98
2001	98
2002	99
2003	99
2004	99
2005	99
2006	99
2007	99
2008	99
2009	99
2010	99
2011	99
2012	95
2013	97
2014	93
2015	96
2016	89
2017	83
2018	87
2019	70
2020	77
2021	68
2022	77