Year	% of children ages 12-23 months
1981	8
1982	27
1983	40
1984	68
1985	79
1986	83
1987	85
1988	84
1989	97
1990	99
1991	85
1992	83
1993	90
1994	90
1995	90
1996	90
1997	93
1998	93
1999	95
2000	94
2001	96
2002	97
2003	98
2004	97
2005	97
2006	97
2007	97
2008	98
2009	98
2010	95
2011	97
2012	97
2013	95
2014	96
2015	96
2016	97
2017	98
2018	98
2019	98
2020	96
2021	95
2022	96