Year	% of children ages 12-23 months
1980	11
1981	45
1982	43
1983	50
1984	59
1985	76
1986	78
1987	80
1988	82
1989	84
1990	85
1991	85
1992	86
1993	90
1994	90
1995	90
1996	90
1997	92
1998	94
1999	94
2000	94
2001	94
2002	94
2003	94
2004	94
2005	94
2006	92
2007	92
2008	92
2009	93
2010	94
2011	95
2012	96
2013	98
2014	99
2015	99
2016	99
2017	97
2018	99
2019	99
2020	90
2021	96
2022	96