Year	% of children ages 12-23 months
1980	34
1981	42
1982	41
1983	51
1984	53
1985	60
1986	67
1987	71
1988	74
1989	78
1990	80
1991	82
1992	85
1993	90
1994	90
1995	90
1996	90
1997	95
1998	95
1999	96
2000	94
2001	94
2002	94
2003	94
2004	94
2005	92
2006	92
2007	92
2008	92
2009	93
2010	94
2011	95
2012	96
2013	98
2014	99
2015	99
2016	99
2017	99
2018	99
2019	99
2020	99
2021	99
2022	98