Year	% of children ages 12-23 months
1981	39
1982	34
1983	37
1984	40
1985	47
1986	50
1987	41
1988	83
1989	88
1990	96
1991	97
1992	98
1993	86
1994	97
1995	96
1996	95
1997	96
1998	98
1999	97
2000	99
2001	98
2002	97
2003	96
2004	97
2005	97
2006	97
2007	97
2008	97
2009	98
2010	97
2011	96
2012	98
2013	99
2014	99
2015	99
2016	99
2017	99
2018	99
2019	99
2020	98
2021	97
2022	98