Year	% of children ages 12-23 months
1980	17
1981	12
1982	6
1983	1
1984	20
1985	18
1986	11
1987	61
1988	70
1989	86
1990	92
1991	82
1992	84
1993	84
1994	80
1995	85
1996	89
1997	91
1998	93
1999	93
2000	92
2001	95
2002	98
2003	98
2004	99
2005	97
2006	99
2007	98
2008	97
2009	94
2010	97
2011	98
2012	99
2013	97
2014	98
2015	98
2016	98
2017	99
2018	99
2019	98
2020	97
2021	95
2022	94