Year	% of children ages 12-23 months
1980	67
1981	66
1982	73
1983	58
1984	54
1985	57
1986	62
1987	69
1988	68
1989	84
1990	90
1991	92
1992	94
1993	91
1994	95
1995	98
1996	97
1997	98
1998	97
1999	97
2000	98
2001	96
2002	94
2003	96
2004	95
2005	96
2006	95
2007	97
2008	97
2009	97
2010	96
2011	96
2012	97
2013	97
2014	97
2015	99
2016	98
2017	99
2018	99
2019	98
2020	98
2021	95
2022	97